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skywatcher at 18:49 PM on 5 July 2011Google It - Clean Energy is Good for the Economy
#46: "... we know that we are in a wet cycle ..." Any peer-reviewed evidence for that? I would equally say that the risk of large floods has increased due to a warmer atmosphere (as predicted), and so the risk will last as long as the atmosphere is warmer, ie much more than 60 years. Frankly in this whole thread you've posted opinions without any supporting evidence, leaning heavily on your own 'experience' to dismiss the benefits of a carbon tax for encouraging a switch to cleaner energy sources. So I'll dismiss your claims with my 'experience'... if a product is cheaper than a competitor's as a result of one being carbon-taxed and the other not, I'll buy that product and the competitor will eventually go out of business. Meanwhile the manufacturer using clean energy will grow at the expense of the dirty manufacturer. Cleaner energy use preference will increase significantly, regardless of overall energy efficiency, for which there is always a uniform motivation. This will also bring clean energy costs down, benefitting everyone, quite apart from the natural process of lowering costs that happens as a technology reaches maturity. Definitely seems a positive process to me, both economically and environmentally. -
alan_marshall at 18:37 PM on 5 July 2011OA not OK part 2: Thermodynamic duo
Thanks Doug, I liked the memorable illustration of the peanuts. -
Norman at 18:33 PM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
Dikran Marsupial, You ask some really good questions that are thought provoking. It would seem the mathematical model of the double pendulum is scientific since the equations can offer testable explanations about the nature of the pendulum and offer predictibility about the overall behavior of pendulum. That is if you would use the equations and run a long term simulation, the simulation would trace out the same area as an actual pendulum if this were videotaped. A software model of the pendulum would be worthless as a science as it would not give any useful prediction of the pendulum's nature. The science of meterology does not try to make predictions about the weather beyond a few days because they know such activity is nonscientific and useless. The prediction means nothing. It is a very good question and I don't know if I answered it to your liking. However, in the world of climate models, climate is an aggregate of weather patterns for a region. One could not predict anyone actual thunderstorm in the region months in advance, but a good climate model should be able to predict is a region will have more our less moisture over a given period of time. If it can't do this and make a valid prediction, the model would not be good for much and a new one should be developed. -
Dikran Marsupial at 17:20 PM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
Norman wrote: "If a climate model is to be considered scientific then it must pass the test of predictability. If the model is incapable of making valid tested predictions why would you consider it scientific?" As I pointed out earlier, you can write down the physics of a double pendulum on a side of A4 paper. You can use that description to make a computational model of a double pendulum (often set as a student project - it isn't difficult). Can that sofware model make useful predictions of the trajectory of a double pendulum? No. Does that mean a mathematical model of a double pendulum is non-scientific. I look forward to a direct answer to this question. -
quokka at 17:04 PM on 5 July 2011German Energy Priorities
More on the consequences of the Fukushima accident: TEPCO recently reported that 124 of it's workers have received a radiation dose of over 100 mSv. Working Conditions Improve at Fukushima Assuming an increased risk of a fatal cancer of 5% per Sv, that's an expected increase in the number of fatal cancers among plant workers of just one. By comparison in the aftermath of Chernobyl, 300,000 'liquidators' received an average dose of nearly 150 mSv. The UNSCEAR Chairman has said that he doesn't expect to find health effects either in the general population or plant workers based on current evidence. It will take a couple of years for UNSCEAR to compile it's study. U.N. body to probe Fukushima radiation impact -
Tom Curtis at 16:53 PM on 5 July 2011German Energy Priorities
quokka @23:"The four destroyed reactors at Fukushima Daiichi had a total capacity of 2719 MWe. We can add reactors 5 and 6 to the list that will never operate again giving a total capacity of 2719 + 1827 = 4546 GWe."
I presume that is 4,546 MWe. That still yields a replacement cost of 7 to 22 billion for all reactors. I agree, however, that even a Fukushima style accident every thirty years or so does not mean that nuclear is better than coal or gas. It does, I think, call into question the claimed superiority of nuclear power to renewable power claimed by "nuke boosters". -
quokka at 16:30 PM on 5 July 2011German Energy Priorities
#22 michael sweet The four destroyed reactors at Fukushima Daiichi had a total capacity of 2719 MWe. We can add reactors 5 and 6 to the list that will never operate again giving a total capacity of 2719 + 1827 = 4546 GWe. The most modern of all these reactors came on line in 1979. Most of their value is depeciated away already. In themselves they are not a huge loss. In any case $10 billion per new reactor is way off. Current builds run between about $1.6 billion per GWe (China CPR1000) to about $5 billion per GWe (Finland EPR-France)to $3.8 per GWe (UAE - Sth Korea). You can find IEA assessment of new nuclear build costs over a range of countries here: New Nuclear Power Costs For Japan, they report $3billion/GWe overnight costs. My Fukushima accident costs were just an assumption. If you double or triple them, it does not diminish the validity of what I was saying. -
Michele at 16:13 PM on 5 July 2011The Planetary Greenhouse Engine Revisited
@ Patrick I never argued that the radiation flows because I am strongly convinced that it doesn’t occur. What flows is the wasted energy which is collected into the one/two cul-de-sac and then converted to radiation and so disposed of. I think that if you continue to argue about the total radiative balance we could leak the true causes leading to actual temperature profiles (GH effect). Of course the radiation/evaporation also takes place on the way but it seems to be very tiny as its contribute to the lapse rate seems to be negligible: if it had a real weight the lapse rate of troposphere, e.g., would be always hyper-adiabatic, whereas we well know it is, at large scale, adiabatic or at least hypo-adiabatic. Aside that, it is undeniable that the atmosphere, by means of the temperature gradients, behaves as a scavenger which sweeps and collects the waste energy toward the tropopause and the mesopause where the heat has only one way to escape to space: it has to be converted thermally to radiation. as the results of my simulation show, also if roughly. The temperature profiles are determined by the conduction/convection and, above all, by the conversion heat->radiation localized within the collection regions where the heat remains confined. -
Stevo at 16:05 PM on 5 July 2011Monthly Climate Summary: May 2011
Thanks for that scaddenp, I had been able to find nothing about it. -
From Peru at 15:41 PM on 5 July 2011Trouble Brewing in the North
Maybe we could call you The Incorruptible Moderator If only the collapse of a ice shelf could have the public impact of this:
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DLB at 15:25 PM on 5 July 2011Great Barrier Reef Part 1: Current Conditions and Human Impacts
John Bruno @13, what do you mean by "they interpreted evidence of no trend during that time period as indicating no trend during that time period" ? -
JoeRG at 15:12 PM on 5 July 2011It's the sun
The IPCC did run 14 'anthro+nat' models and only 5 'nat' models that possibly were independent from the other (the last is not to prove, because the description is not longer available). This cannot be the correct method because Stott had a dependence between the models. If the anthropogenic forcings sum in a negative net forcing (what is necessary for a global cooling caused by the overwhealming of GHGs by aerosols, what commonly is called 'global dimming', occured mid century), then it is obvious that the natural forcings must show higher temperatures as far as they had no change in intensity (as to the time until '63, natural forcings had always caused a warming). If you use independent models (at least 9 of the 'anthro+nat' were it definitely) there cannot be a correct result. Otherwise we would not speak about a 'primarily anthropogenic' driven cooling. That was what made it curious to me. Possible additional influences could be, as told before, for example number and intensities of flares. Each major flare destroyes an huge amount of high-stratospheric Ozone what reduces the absorption of high frequency radiation there. This, of course, has only a small short term influence, but the long term effect that results in the lagrer absorption by oceans is currently not researched, but this is currently the only explanation for the sharp rise of the OHC in 2003. In this year we've seen the most and most intense flares, culminated in the biggest flare ever measured (X28..X40, not quite sure, because the direct measurements are only possible until X17.2). -
Antarcticice at 15:10 PM on 5 July 2011Glickstein and WUWT's Confusion about Reasoned Skepticism
Ira Glickstein, seems to be like many of the experts on watts (including watts himself) not really an expert. Glickstein is an engineer (it even for once states what he is at the bottom of his comment) There are over 500 of the ill-informed backslapping him for his comments, it's all a bit sad really. Point B.6 shows the dishonesty of these comments Co2 lag is pretty easily explained by the planet taking that period of time to warm to level were Co2 starts to be added then further warming follows, a point Glickstein fails to even mention. P.S. WUWT seem to be crowing about a new paper they claim proves no warming between 1998 & 2008 the choice of the start and stop years is for pretty obvious reasons as it turns out the authors are statisticians not climate scientists, but WUWT are claiming this paper is going to appear in PNAS, I find it hard to imagine they would fall for such a cheap trick. http://wattsupwiththat.com/2011/07/04/a-peer-reviewed-admission-that-global-surface-temperatures-did-not-rise-dr-david-whitehouse-on-the-pnas-paper-kaufmann-et-al-2011/Response:[DB] Note that Whitehouse is a recidivist dissembler and has been eviscerated by Tamino on multiple occasions on multiple points.
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michael sweet at 14:22 PM on 5 July 2011German Energy Priorities
Quokka, It seems to me that at 16 you have underestimated the cleanup costs of Fukishima. Since the 4 (6?) power plants that have been destroyed at Fukishima had a replacement value of at least $10,000,000,000 each (a reactor proposed near me is currently estimated at $18B), that alone is $40B. How much is evacuating the surrounding area, for years, worth? The farming must be worth a lot in such a large area, not to mention the fishing and tourism. If you want to count the costs against the entire nuclear industry you should cost Chernobyl and 3 mile island also. The reactors would be worth at least $20B. What is your estimate of the value of the land around Chernobyl for decades? What are the cleanup costs so far at Chernobyl (financed by other governments)? It starts to look like real money. It is very difficult to find investors in the US who are willing to take the risk. Most of the proposed plants require government financing. As Dana points out, nuclear is better than coal. It is hard to compare nuclear costs when it is so difficult to find out what they are. -
Tom Curtis at 14:20 PM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
Norman @233: Trapp et al, 2009:"We investigate the transient response of severe thunderstorm forcing to the time-varying greenhouse gas concentrations associated with the A1B emissions scenario. Using a five-member ensemble of global climate model experiments, we find a positive trend in such forcing within the United States, over the period 1950 – 2099. The rate of increase varies by geographic region, depending on (i) lowlevel water vapor availability and transport, and (ii) the frequency of synoptic-scale cyclones during the warm season. Our results indicate that deceleration of the greenhouse gas emissions trajectory would likely result in slower increases in severe thunderstorm forcing. Citation: Trapp, R. J., N. S. Diffenbaugh, and A. Gluhovsky (2009), Transient response of severe thunderstorm forcing to elevated greenhouse gas concentrations,"
From Trapp et al, 2007:
"Fig. 1. Difference (A2 − RF) in mean CAPE, vertical wind shear over the surface to 6 km layer (S06), mean surface specific humidity (qs ), and severe thunderstorm environment days (NDSEV) for March–April–May (MAM) (a–d) and June–July–August (JJA) (e–h), respectively. The RF integration period is 1962–1989, and the A2 integration period is 2072–2099.">/blockquote>
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scaddenp at 14:15 PM on 5 July 2011Monthly Climate Summary: May 2011
I'm with Eric on this. I dont think monthly weather summaries say much about climate at all. We dont know how ENSO will be affected by warming - the jury is well and truly still out. -
Stevo at 13:56 PM on 5 July 2011Monthly Climate Summary: May 2011
Eric, Does overall warming effect the ENSO? and if so, how? -
quokka at 13:50 PM on 5 July 2011German Energy Priorities
@20 dana1981 If you want to look at comparable Western European economies, then try this. It is still not obvious to me that Germany is THE pacesetter. The standout of course is France because of nuclear power. From the Google data, both France and Germany have reduced their emissions about 20% from 1991 to 2007. The UK by about 15%. By 1990, France had already essentially completed their build of nuclear. -
dana1981 at 13:28 PM on 5 July 2011German Energy Priorities
quokka - most of the countries in your graph with larger emissions cuts than Germany are Eastern European, and probably had a lot more to do with economic struggles after the collapse of the USSR than actual efforts to reduce emissions. In recent years, emissions have started to rise for many of those countries. As I noted in the post, Germany is at around half the per capita emissions of USA, Canada, and Australia, and has reduced emissions >20% since 1990 due to concrete efforts to make that happen, not just economic struggles. I think it's fair to call them a pace setter. -
beastie at 13:25 PM on 5 July 2011The chief troupier: the follies of Mr Monckton
Thank you to all posters who replied to my comment, your answers were very informative, Did anyone check "The fair farming group"? A reply to their screed on the ether by someone knowledgeable could be handy. The members are farmers, but you would have to say that has been their hobby, one is a stockbroker, one a banker etc. . That is really beside the point, but they do have the ear of numerous pollies and ex pollies. Their wacko petition to parliament perhaps should be countered. -
scaddenp at 13:15 PM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
I would say that you are making the hypothesis that there is unforced cycles in the weather pattern and these alone are enough to explain weather. An alternative hypothesis which doesnt require unexplained cycles is to use existing physics and postulate that these are result of global warming. Now I would also agree that while weather patterns are consistent with global warming hypothesis, the predictions about extreme weather are not sufficiently robust (model cell size is too large) nor is the observation period long enough to make strong statements on variations compared to natural variability. However, as a guide to how insurance companies and governments with a lot at stake, I would act in precautionary way rather than depend on the hope of that this is a cycle which has no physical basis yet. -
Tom Curtis at 12:58 PM on 5 July 2011A Detailed Look at Renewable Baseload Energy
Mark Harrigan @134, the issue of "spin up time" is significantly overstated. In framing the issue, anti-renewable campaigners assume the auxiliary power stations must be independent gas or biofuel plants. One alternative is to design them as solar-thermal plaints with auxiliary gas heating. As the plant is already in continuous operation, the plant will neither need to spin up from scratch nor consume fuel in idle times. -
Norman at 12:57 PM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
scaddenp My series of posts are an attempt to determine the validity of this question by Jeff Master "Has human-caused climate change destabilized the climate, bringing these extreme, unprecedented weather events?" I am investigating if these are extreme, unprecendented weather events by looking at long time series of weather related phenomena in various regions of the globe. Would a destabalized climate look much different than past climates? When I look at long term climate patterns I see these cycles (longer than 30 years). Maybe my vision is poor. But I still have not seen variations that seem to be "outside the envelope". They may beome a reality, that is a different question with its own set of complications. The question here are 2010-2011 weather extremes an example of climate disruption caused by global warming. -
scaddenp at 12:57 PM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
Like gravity, the physics of climate is well understood but like hyperion, all that understanding will not make some things predictable. "If the model is incapable of making valid tested predictions why would you consider it scientific" Well first and foremost, climate models make numerous testable predictions. Some predictions are more robust than others (the level to which the physics is captured by the computer model as well as influence of chaos) and some with greater certainty than others. The strawman is to demand a prediction from the model that it cannot deliver and ignore the predictions that it can make. Note how well Broecker's prediction for temperature in 2010 made in 1975 was. I will also grant that the actual accuracy was considerably better than the model was actually capable of delivering. I would reject current climate theory if the robust predictions of the models do not match predictions within the uncertainties of the model but I see no evidence for that. -
Tom Curtis at 12:51 PM on 5 July 2011A Detailed Look at Renewable Baseload Energy
Mark Harrigan @135, as stated previously, my major problem with the nuclear industry is that they simply do not honestly report the costs of the nuclear industry in summary statistics. They are not alone in this, with anti-nuclear lobbyists being, if anything, even more dishonest. The consequence is that for non-experts no clear indication of the risk can be found, and in terms of comparisons with renewable energy sources, the risks and costs of nuclear power are significantly understated. I will give you two examples of this. First, you assure us that "The technology is CO2 free in operation", but it is not. In operation, the generation of nuclear power requires the mining, and refining of uranium, the manufacture of fuel rods (or alternatives in newer designs), the transport of ore, refined uranium, and rods to the appropriate location, and then the transport and removal of the spent fuel and other waste. None of these are emission free operations. And for none of these are their equivalent CO2 emissions from renewables. I am willing to accept that the overall emissions from these processes are small relative to power production, that they are much smaller than the equivalent costs for coal (and to a lesser extent natural gas and oil), and that in principle they can be eliminated by moving to an emissions free economy. But they exist. Consequently they should be included in any estimate of operational CO2 emissions from nuclear power. So, do you know of any reliable source that budgets nuclear operational CO2 emissions including the entire fuel and waste cycle? I have even greater trouble with the mortality figures. Deaths for solar and wind power are essentially limited to those caused by accidents during instillation and (for wind power) maintenance. Further, large scale construction projects have a lower death rate per hour worked than small scale construction projects. But 11 times smaller than for PV? And that is assuming that no deaths from operational accidents, nuclear accidents, or in the mining, processing and waste management cycles. Using Quokka's estimate, the 0.04 deaths per Terrawatt represents 2800 deaths. Using BBD's preferred source, there where 28 deaths among emergency workers at Chernobyl, and 15 from Thyroid Cancer up to 2002; but an expected 4000 Chernobyl related cancer deaths are expected in the effected population. (See also http://www.iaea.org/Publications/Booklets/Chernobyl/chernobyl.pdf) That already exceeds the 0.04 figure. Perhaps the nuclear industry does not count cancer deaths from radiation exposure in their figures. No doubt they will also assure us that smoking does not cause lung cancer. Mining is a major cause of mortality in the uranium fuel cycle. In the US across all mines, on average there is one death per annum per 520 full time workers. Given that there are well over a hundred uranium mines world wide, that probably translates into deaths in the hundreds each year just from mining operations alone. Indeed, mining uranium has unusual hazards, both from the radioactivity of the ore itself, and from the release of radon gas. One study shows an excess of 24 deaths (actual deaths: 34, expected: 10.2) from lung cancer in a cohort of 757 Navajo uranium miners. Based on these figures, total deaths from the nuclear power industry, excluding accidents such as Chernobyl and Fukushima is likely to be much higher than the 0.04 per Terrawatt indicated. Again, if you have reliable information including whole of fuel cycle figures, I would be very interested. One small point that goes unnoticed in these mortality figures is that large nuclear industry accidents have a very large health cost relative to mortalities. For example, only 15 people died of thyroid cancer to 2002, but around four thousand people got thyroid cancer who otherwise would not have. You can probably see my concerns from these examples. I also have concerns about reported costs of generation. Do they include the costs from large scale accidents as well. Please note that these costs to health and in CO2 emissions pale in comparison to equivalent figures from coal. There is no basis from these considerations to get rid of nuclear power in favour of any fossil fuel, or to not introduce nuclear power as a substitute for fossil fuels. But the selective statistics used for comparison data make a proper comparison between nuclear and renewable options difficult, and significantly overstate the advantage of nuclear, if any. -
Norman at 12:38 PM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
scaddenp @ 240 and 241 Not sure I understand your line of reasoning. The definition of science is given above. Gravity has a linking mechanism, all matter attracts and it does so by the working equation F=G(M1*M2)/r^2. Certain systems of gravity cannot be predicted. They are outside the realm of science. Even accumulating more information on the system will not make it more predictable. Example of chaotic gravity. After 10 years with Hyperion you may not be able to build a model to predict its motion but gravity is still scientific. If you have the measurements of its mass, Saturn's mass, its distance from Saturn, you can come up with a precise measure of the gravitational force acting on this moon. If a climate model is to be considered scientific then it must pass the test of predictability. If the model is incapable of making valid tested predictions why would you consider it scientific? -
scaddenp at 12:23 PM on 5 July 2011Google It - Clean Energy is Good for the Economy
The pluses and minuses of high dams here get a lot of debate. Plus - new fisheries (introduced species - salmon), recreational lakes, flood control, MAYBE irrigation potential, and of course power. Minus - earthquake hazard, loss of habitat and/or farming potential, unsolved problem with native fisheries (which is more complex problem than just dams in case of the very valuable whitebait), competition with downstream irrigators for water, loss of whitewater recreation/tourism. In my opinion, you prioritize sites, sacrifice some rivers with a lot of dams, leave others free. An unavoidably complex process of evaluating conflicting values. -
quokka at 12:07 PM on 5 July 2011German Energy Priorities
#18 Agnostic, Do you have any recent data to back that up. According to these 2005 figures, Germany was performing somewhere in the middle of the pack with respect to both Kyoto commitments and in absolute per capita emissions reductions. -
Eric (skeptic) at 11:56 AM on 5 July 2011Google It - Clean Energy is Good for the Economy
The costs depend on the dam. Some dams would create value by steadying the water level and creating a better fishery. Most of the land on the flood plain around me is used for grazing or sometimes pasture or most often it is just mowed for aesthetic or recreational reasons. Some is wooded and that would be lost (harvested). A run-of-the-river hydro in my case would capture a tiny fraction of a dam (perhaps 10X less head and hundreds or thousands of times less flow). Also a run-of-the-river installation below my house would have to be completely submersible to withstand 30 foot floods. Incidentally I can anchor a floating generator with no approval whatsoever since it is "removable". Anything else would be a regulatory nightmare. -
Camburn at 11:43 AM on 5 July 2011Google It - Clean Energy is Good for the Economy
adelady: I was indicating dams on the river. They would serve a two fold purpose. Flood mitigation as well as a source to generate power. The externalized costs of a damn must be balanced against the cost of flooding. In the case of the upper Missouri Basin, we know that we are in a wet cycle and it previous cycles are an indication, flooding will be common for the next 60+ years. An example of the area flooded just this year...you could build a sizeable dam and the flood control provided could allow dam external to be flat for 50 years. There were millions of acres flooded this year alone. In the USA this would be easy to fund. Just take 100Billion out of defense, (which is severaly bloated) use 50 billion to reduce the deficit and use the other 50 billion to build dams. -
Camburn at 11:32 AM on 5 July 2011Trouble Brewing in the North
DB: Can we just start calling you Dr. Who? -
Riduna at 11:29 AM on 5 July 2011German Energy Priorities
Germany is unquestionably the pace setter when it comes to reducing CO2 emissions in terms of what it has already achieved and what it proposes. Its 2020 target can be achieved though probably not without supplementation such as import of electricity from France and Denmark or improvement in the storage and distribution of energy over the present decade. Both are possible. The latter is more important, particularly ability to store electricity and efficiently release it in response to periodic increased demand. -
scaddenp at 11:27 AM on 5 July 2011Google It - Clean Energy is Good for the Economy
Good point adelady. I was not externalising costs and I agree that should be on same basis as carbon. This is a debate that goes on quite a bit here as we look for more hydro power. Except in a maybe 8 more sites, wind and geothermal are cheaper (ignore externalised costs) than hydro and in those 8 sites, there are significant external costs to building a dam. Just remember that not only is run-of-river more expensive per GJ, but there is considerably less total GJ available in practical terms. -
adelady at 11:07 AM on 5 July 2011Google It - Clean Energy is Good for the Economy
"... usually more expensive per GJ than high dam." Externalised costs? If we insist on accounting for externalised costs for carbon, we should do the same for renewables. Surely one of the great advantages of wind and solar (esp PV) is that it allows multiple uses of the power producing area. And dams not only disallow other uses, they destroy other valuable things. Like forests and farmland and communities. Or does the accounting include all of these things - I don't know. -
John Bruno at 11:02 AM on 5 July 2011Great Barrier Reef Part 1: Current Conditions and Human Impacts
Rob thanks for your comments about fisheries in NZ! It is funny, but your point about the crazy definition of "overfished" used by fisheries managers comes up all the time (at least in my world). It is maddening that a population reduced to a third or more of its very recent size will often NOT be considered overfishing by fisheries biologist and managers. We ran a post and a forum about this issue recently on SeaMonster here and honestly, the variety of definitions of what "overfishing" is underlies a lot of the dispute about the state of the world's fisheries, although the topic rarely comes up (in part because when you burrow in, it gets very complex). Yeah, I have a soft spot for plants! It causes be lots of trouble in a field where plants are considered vermin to be exterminated (ie, "slime" in high-priest of marine environmentalism JBC Jackson's vernacular) I feel like a coyote or wolf biologists in the 19th century. I still have hope minds can be changed... -
scaddenp at 10:50 AM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
And by same token we can predict earth or mars location and attitude 10 years out to high degree of precision. That make gravity an inconsistent theory? -
John Bruno at 10:48 AM on 5 July 2011Great Barrier Reef Part 1: Current Conditions and Human Impacts
Dear jmsully, The AIMS Osborne paper, although strikingly similar to Sweatman et al in many regards, comes to a different conclusion about the historical state of the GBR. In their abstract, Osborne et al state: "While the limited data for the GBR prior to the 1980’s suggests that coral cover was higher than in our survey, we found no evidence of consistent, system-wide decline in coral cover since 1995" Thus, like many others (eg, Bruno and Selig 2007 PLoS One), they interpreted evidence of no trend during that time period as indicating no trend during that time period. Sweatman et al - along with Andrew Bolt, Bob Carter and others - in contrast used this evidence to support their argument that the GBR is pristine or near pristine, ie, it hasn't change much if at all (i.e. they argued that the state of the reef in 1995 is representative of the system baseline). -
scaddenp at 10:48 AM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
Norman, all predictions are couched in terms of their inherent uncertainty. You could predict the location of say Saturn's moon Hyperion in 10 years time but you dont have a chance in hell of predicting it attitude. Does that make gravity unscientific? -
dhogaza at 10:41 AM on 5 July 2011Trouble Brewing in the North
"At the moment, this post says "Posted on 14 July 2011 ..." Ice fortress ... Bastille Day ... it all sorta fits, no?Response:[DB] Fixed pub date (and they said I'd never make it as a Timelord...).
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scaddenp at 10:37 AM on 5 July 2011It's the sun
Joe, I cant make sense of your sentence. ": while the global dimming the only natural caused temperature is higher than the total (anthro+nat)." Its certainly not obvious to me why you think IPCC misrepresents Stott. What do you mean by "global dimming"? "it is surely not the only parameter that may be of importance" Well when you have some other parameter that makes physical sense, let us know. Meanwhile I will continue to look at the well-established, measurable physics of GHGs. If you ignore them, you cant get planetary temperature right so why do think changing their forcing is so insignificant compared to same change in solar forcing? -
scaddenp at 10:26 AM on 5 July 2011Google It - Clean Energy is Good for the Economy
I am assuming Camburn is proposing a lake in national park. I suspect Camburn thinks all "alarmists" are greenies and so is trying a wind up. I dont know the US at all so happy to take his word for it, though from experience here, run-of-river generates less power and so usually more expensive per GJ than high dam. -
quokka at 09:25 AM on 5 July 2011German Energy Priorities
#13 peter prewett, Oldbury has old Magnox reactors which are known to be difficult and expensive to decommission. They are not representative of decommissioning issues or costs for water moderated, water cooled reactors such as PWRs, BWRs and CANDUs. -
quokka at 09:17 AM on 5 July 2011German Energy Priorities
I did a little back of the envelope calculation to test out the proposition that cost of the Fukushima accident is "proof" that nuclear power is too expensive. This is what I came up with: Over the whole history of nuclear power worldwide, total electricity generated: ~70,000,000 GWh (from eyeballing the chart here: http://www.world-nuclear.org/info/inf01.html ) Assuming that has displaced black coal at ~900 grams/kWh CO2 implies an emissions saving of ~63,000,000,000 tonnes CO2 For an assumed cleanup cost of $100,000,000,000 at Fukishima that is an additional CO2 abatement cost of ~$1.40 per tonne CO2 over the whole history of nuclear power. -
Patrick 027 at 08:22 AM on 5 July 2011The Planetary Greenhouse Engine Revisited
Re Michele - Also remember, in your analogy, liquid water is the enthalpy contained in the non-photons. Thus, the topography you speak of is not a landscape that directs water flow - it is the liquid water itself! And given that (except at sufficiently great heights) there is little conduction and no spontaneous convection in the part of the atmosphere being considered, in a radiative equilibrium the only flow of water from one place to another is by evaporation and condensation. But to get a better understanding, again, please try going right to the physics of radiation; this analogy could lead you astray. -
Rob Painting at 08:15 AM on 5 July 2011Great Barrier Reef Part 1: Current Conditions and Human Impacts
ETR - Bleaching is short-term, it occurs when surface waters rise 1-2°C above the normal summer maximum. See my post Coral: life's a bleach... and then you die In the Caribbean many of the reefs are not recovering, as bleaching and associated disease are killing them. Many areas, that were once coral reefs are now covered in seaweed and slime (macroalgae - John Bruno will tell me off for using the word 'slime'). See 'Doctor Doom" - Jeremy Jackson's talk Look at the state of the Caribbean sea surface temperatures now:
If that trend continues through to September/October 2011 we will have another bleaching event in the Caribbean. Not a rosy future for coral sadly.
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Eric the Red at 08:03 AM on 5 July 2011Monthly Climate Summary: May 2011
Stevo, Much of the pattern is also totally in line with a stron La Nina. Long term trends are much better indicators than short term anomalies. -
BBD at 07:44 AM on 5 July 2011A Detailed Look at Renewable Baseload Energy
Mark Harrigan Many good points at 134, culminating in:Can we advance the debate by seeking solutions to the problems of renewables?
Yes, of course. But this is implicit in all future renewables scenarios, as we see with Diesendorf (2010). People have been thinking about the solutions for a long time. There is real potential here, but the upper bound appears to be ca 30% of the global energy mix by 2050. If not rather less. This is the problem with renewables. The potential is either misrepresented (high renewables scenarios), or optimistic (30%). Even assuming the latter, there is a very large elephant in the room. -
Norman at 07:27 AM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
adelady @ 238 You have pointed out one of the needs for a study to considered scientific, predictablitity. They do know some chemicals in cigarette smoke are capable of damaging DNA (which could lead to cancer). So there is a tenuous link even if it can't be specifically detemined. If a climate model would predict events sometimes and not so well at other times then it would fail in the predictablity deparment and I would not consider it science based upon the accepted definition of this concept. -
From Peru at 07:06 AM on 5 July 2011German Energy Priorities
(continuation) But there is the alternative of nuclear fusion. The easiest process is the Deuterium(H-2) + Tritium(H-3) fusion, that produces Helium-3 plus one neutron: H-1 + H-3 → He-3 + n
This reaction still requires a relatively rare isotope, Tritium. It can be obtained from litium:
n + Li-6 → H-3 + He-4
n + Li-7 → H-3 + He-4 + n
Litium is still a non-renewable metal that must be mined.
But there is the D-D reaction, that uses just deuterium:
H-1 + H-2 → H-3 + H-1 or He-3 + n
This uses the abundant deuterium, found in the abundant water on Earth.
Water is considered renewable (actually isn’t, but there is so much of it that will behave as if it were a never-ending resource, just like the hydrogen burned to helium in sun in a similar nuclear fusion reaction)
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adelady at 07:03 AM on 5 July 20112010 - 2011: Earth's most extreme weather since 1816?
Norman "It would be a science if the models have known mechanisms for explaining why the preciptiation will increase ... and then if they had predictability." Come on. This is like saying that you can't rely on health experts telling you that when cigarette consumption increases in an area you can expect to see more cases of lung cancer as well as other cancers - because the mechanism for working out how smoke (of all kinds) initiates cancer is poorly understood. Nor can health experts predict with any confidence which particular smokers will contract cancer as against heart disease or stroke or emphysema. Epidemiologists can tell you the expected rate for these diseases given a certain rate of smoking. Doctors can identify which people have developed these diseases and they can treat them - but they can't tell in advance which person will, or will not, develop any smoking related illness. Does that mean it's not science?
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