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All IPCC definitions taken from Climate Change 2007: The Physical Science Basis. Working Group I Contribution to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Annex I, Glossary, pp. 941-954. Cambridge University Press.

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Positives and negatives of global warming

What the science says...

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Negative impacts of global warming on agriculture, health & environment far outweigh any positives.

Climate Myth...

It's not bad

"By the way, if you’re going to vote for something, vote for warming. Less deaths due to cold, regions more habitable, larger crops, longer growing season. That’s good. Warming helps the poor." (John MacArthur)

Here’s a list of cause and effect relationships, showing that most climate change impacts will confer few or no benefits, but may do great harm at considerable cost.


While CO2 is essential for plant growth, all agriculture depends also on steady water supplies, and climate change is likely to disrupt those supplies through floods and droughts. It has been suggested that higher latitudes – Siberia, for example – may become productive due to global warming, but the soil in Arctic and bordering territories is very poor, and the amount of sunlight reaching the ground in summer will not change because it is governed by the tilt of the earth. Agriculture can also be disrupted by wildfires and changes in seasonal periodicity, which is already taking place, and changes to grasslands and water supplies could impact grazing and welfare of domestic livestock. Increased warming may also have a greater effect on countries whose climate is already near or at a temperature limit over which yields reduce or crops fail – in the tropics or sub-Sahara, for example.


Warmer winters would mean fewer deaths, particularly among vulnerable groups like the aged. However, the same groups are also vulnerable to additional heat, and deaths attributable to heatwaves are expected to be approximately five times as great as winter deaths prevented. It is widely believed that warmer climes will encourage migration of disease-bearing insects like mosquitoes and malaria is already appearing in places it hasn’t been seen before.

Polar Melting

While the opening of a year-round ice free Arctic passage between the Atlantic and Pacific oceans would confer some commercial benefits, these are considerably outweighed by the negatives. Detrimental effects include loss of polar bear habitat and increased mobile ice hazards to shipping. The loss of ice albedo (the reflection of heat), causing the ocean to absorb more heat, is also a positive feedback; the warming waters increase glacier and Greenland ice cap melt, as well as raising the temperature of Arctic tundra, which then releases methane, a very potent greenhouse gas (methane is also released from the sea-bed, where it is trapped in ice-crystals called clathrates). Melting of the Antarctic ice shelves is predicted to add further to sea-level rise with no benefits accruing.

Ocean Acidification

A cause for considerable concern, there appear to be no benefits to the change in pH of the oceans. This process is caused by additional CO2 being absorbed in the water, and may have severe destabilising effects on the entire oceanic food-chain.

Melting Glaciers

The effects of glaciers melting are largely detrimental, the principle impact being that many millions of people (one-sixth of the world’s population) depend on fresh water supplied each year by natural spring melt and regrowth cycles and those water supplies – drinking water, agriculture – may fail.

Sea Level Rise

Many parts of the world are low-lying and will be severely affected by modest sea rises. Rice paddies are being inundated with salt water, which destroys the crops. Seawater is contaminating rivers as it mixes with fresh water further upstream, and aquifers are becoming polluted. Given that the IPCC did not include melt-water from the Greenland and Antarctic ice-caps due to uncertainties at that time, estimates of sea-level rise are feared to considerably underestimate the scale of the problem. There are no proposed benefits to sea-level rise.


Positive effects of climate change may include greener rainforests and enhanced plant growth in the Amazon, increased vegitation in northern latitudes and possible increases in plankton biomass in some parts of the ocean. Negative responses may include further growth of oxygen poor ocean zones, contamination or exhaustion of fresh water, increased incidence of natural fires, extensive vegetation die-off due to droughts, increased risk of coral extinction, decline in global photoplankton, changes in migration patterns of birds and animals, changes in seasonal periodicity, disruption to food chains and species loss.


The economic impacts of climate change may be catastrophic, while there have been very few benefits projected at all. The Stern report made clear the overall pattern of economic distress, and while the specific numbers may be contested, the costs of climate change were far in excess of the costs of preventing it. Certain scenarios projected in the IPCC AR4 report would witness massive migration as low-lying countries were flooded. Disruptions to global trade, transport, energy supplies and labour markets, banking and finance, investment and insurance, would all wreak havoc on the stability of both developed and developing nations. Markets would endure increased volatility and institutional investors such as pension funds and insurance companies would experience considerable difficulty.

Developing countries, some of which are already embroiled in military conflict, may be drawn into larger and more protracted disputes over water, energy supplies or food, all of which may disrupt economic growth at a time when developing countries are beset by more egregious manifestations of climate change. It is widely accepted that the detrimental effects of climate change will be visited largely on the countries least equipped to adapt, socially or economically.

Basic rebuttal written by GPWayne

Update July 2015:

Here is a related lecture-video from Denial101x - Making Sense of Climate Science Denial


Last updated on 5 July 2015 by pattimer. View Archives

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Further reading

National Geographic have an informative article listing the various positives and negatives of global warming for Greenland.

Climate Wizard is an interactive tool that lets you examine projected temperature and precipitation changes for any part of the world.

A good overview of the impacts of ocean acidification is found in Ken Caldeira's What Corals are Dying to Tell Us About CO2 and Ocean Acidification


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Comments 26 to 50 out of 404:

  1. Vinny Burgoo at 07:35 AM on 13 March, 2010 "The whole field is less than scientifically kosher and large areas of it are politicised. " Mountains out of molehills, you illustrate my point nicely, thanks. What about dehydration is political, anyway? I don't understand that.
  2. Is warming good or bad? If it prevents an ice age it is good. In the ice age section it is said "we will not have an ice age because of the CO2 we have released." Well that may mean that in the future we do not get any warmer if the ice age mechanism continues and the CO2 effects cancel it out. So our greenhouse gases do good. If the ice age factors are at work. An ice age is not the only outcome, but the factors may be just as important as COP2. OK?
  3. There is a element of presentation that tends to mislead. I will give an example. There is only one benefit listed for human health, but several detriments. This obscures the fact that in net, warming is benefit to human health. I am not saying it is good for humans, I am saying that the higher temperatures themselves are a benefit. Where do people vacation? In Greenland, or in Crimea? Clearly, the temperatures themselves are not the problem.
    Response: I'm open to adding more benefits - if you find peer-reviewed papers that show benefits to health from global warming, please post them and I'll add them to the list.
  4. coloursoflife, do you really think that the behaviour during vacations is an appropiate indicator of the overall benefit of a climate over another? I could agree only if you let me stay on paid vacation 365 days a year :)
  5. Agriculture negatives- More CO2 produces lower protein levels in the plants, so a larger quantity is needed to provide the same amount of protein. "Despite the large body of research on the effect of elevated CO2 on primary productivity, few studies consider the overall nutritional value of plants." More CO2 also produces more cyanide in the plant, while at the same time lowering protein in the plant. Animal and human tolerance to cyanide is reduced by lower levels of protein. Coupled with reduced protein levels per plant, this makes plants more toxic. Paper "Changes in Nutritional Value of Cyanogenic Trifolium repens Grown at Elevated Atmospheric CO2" Overview of this research from Monash University Audio and transcript from ABC Science Show interview with Roslyn M. Gleadow
  6. PS Trifolium repens is clover, sort of an important crop
  7. A bit more from the summary at the end of the paper "Protein content of food crops such as wheat and rice are predicted to contain to 15–20% less protein by the end of this century (Taub et al. 2008)." "Insect studies have shown that animals compensate for the lower protein content of plants grown at elevated CO2 by eating more (Lincoln et al. 1993). If this is also true of grazing mammals, then they would ingest more cyanogenic glycosides along with the rest of the plants in mixed pastures." " is possible that pastures rich in T. repens could become unsuitable for livestock if atmospheric CO2 continues to increase."
  8. A bit far fetched maybe, but AGW is causing more space junk to threaten satellites and spacestations. The cooling of the stratosphere causes the atmosphere to contract which lowers the density of the upper atmosphere. This reduces drag on debris which therefore stays longer in orbit.
  9. The link to the skeptic argument is broken.
  10. Hello all, Just to throw this into the mix...
  11. and this
  12. and why not...
  13. Re: Johngee (37) Dude, ya gotta warn people when posting a link to a video with Monckton testifying in from of Congress!!! You owe me a new keyboard. ;) Re: Johngee (36) Another game-changer; Caldeira has been predicting this for some time (don't have the links handy, but Lord Google Scholar finds much). Tropical forests will continue to be carbon sinks, but temperate & boreal forests transition to net carbon emitters with rising temps (multifactoral reasons). A suggestion: links to papers are appreciated, but it is customary (and just good form) to preface with a summary of understanding of what to expect. This goes double with videos with Monckton... Re: Johngee (35) See above comment about good form (and remember: always book good money on the T-Rex vs people). Make sure to watch the entire Alley CO2 Biggest Control Knob lecture. The Yooper
  14. All taken on board Dan. Watched the lecture. Very good indeed! I'd like to comment on Monckton/congress thing myself but everytime I try my voice gets lost in a scream of discombobulation.
  15. Re: Johngee (39) Welcome aboard. There's room for all here. At Real Climate, Climate Progress, Deep Climate, Rabett Run, Open Mind, Only In It For The Gold (the list of quality science blogs is very long). I lurked for about 18 months before I started chiming in. There's a ton of basal and ancillary background material to digest. If you're interested, go to Real Climate to the Start Here tab & find your comfort level. Any questions I can help with, just post. Welcome aboard. The Yooper
  16. 'Severe consequences for over 60 million people dependent on ice and snow melt for water supply (Barnett 2005, Immerzeel 2010)' It's good to see that you update things, JC, but now you've understated the problem. Immerzeel et al's 60 million is related to ice-melt alone (not ice and snow) and is for only five river basins. Adding the inhabitants of the Tarim oases in NW China might take the number that'll eventually be threatened with food insecurity because of vanished glaciers up to 70 million. (I've never found a reliable number for the western China component. Thanks to Barnett et al, many sources say that 23% of China's population - all in Western China - relies on glacial melt but that's hooey. I suspect the claim originated with a journalist's ambiguous padding of a 2004 newspaper interview with Yao Tandong.) Adding a quota for ex-Soviet Central Asia might take you to... 100 million? The small populations outside Asia... Dunno, but a wild guess: 150 million in all. Or you could stick with ice *and* snow melt and reinstate Barnett's (dodgy) 1 billion. But at the moment you're using a partial number for ice and ascribing it to ice and snow, which is no better than the earlier problem (Barnett's billion all down to ice).
    Response: Thanks for the feedback. I've gone for "at least 60 million people dependent on ice melt" which is as weak as dishwater but Immerzeel is really the best estimate we've got so far, even if it only covers 5 river basins. Where does your figure for NW China come from?
  17. JC: 'Where does your figure for NW China come from?' From a very, very rough estimate of the total population of the Tarim oases.
  18. This PNAS abstract shows decreasing rice yields under higher night time temperatures if you're looking for non greenhouse based work on (dis)advantages of higher CO2 on crop growth.
  19. The amount of debate an attention to minutiae is unbelievable on this site. It is good in a way but I am curious as to why the issues on this site evoke more discussion than almost anything else I can think of. The possible downsides to this arguing about AGW/climate change are that it overshadows other very important issues that affect people and planet. Other issues that are important irrespective of AGW are: Destruction of the rainforest which is needed for species diversity Our oceans are being overfished We use too much of the world's resources on average per person Species extinction Political apathy resulting in necessary change not happening quickly enough Also, if fossil fuels are running out, does this timing coincide nicely with the need to reduce the use of fossil fuels? Finally, I would love an assurance that the people on this site putting masses of effort into collating data and facts actually live in a sustainable way ie. you practice what you profess.
  20. hapivibe wrote : "Finally, I would love an assurance that the people on this site putting masses of effort into collating data and facts actually live in a sustainable way ie. you practice what you profess." Why ? Would you disregard the opinion or diagnosis of a doctor who smokes, especially if you were being told that your cancer was caused by smoking ? Or if you were told to give up smoking because it is badly affecting your health ?
  21. Witnessing myriad discussions focusing on whatever shreds of countervailing evidence are available as alternative explanations for what is at root a fairly simple, bulky and ultimately powerful process leaves me completely unsurprised that you find discussions here dominated by minutiae, hapivibe. Bloating the importance of little things by employing large rhetoric is the sharpest tool in the kit of people who for whatever reason wish to ignore the CO2 problem. You're absolutely right that we're imposing a heavy load on the systems we depend on. Getting a grip on the CO2 problem is a key part of not further exacerbating our failure to account for our impact on the planet. More, there's little reason to believe that solutions to the problems you mention are somehow mutually exclusive, rather it's probably reasonable to suggest that integrated approaches would be more beneficial. As you suggest, apathy is our enemy, an old human failing seemingly only overcome in moments of crisis. Looking at the various graphs of depressing facts, what's the largest contributor to fossil fuel GHG emissions? Coal is the most abundant and presently active feedstock for CO2. There's plenty of coal and we're burning more of it than ever. We're not going to run out of coal fast enough to rely on depletion of fossil fuels as a solution to CO2 emissions. There's no data so far indicating we're going to stop burning coal. Depletion as a solution to CO2 emissions on the timescale of concern here seems a dead-end. Your demand for assurances about sustainable living is of course impossible to answer affirmatively, either for "the people on this site" in general or you yourself. In communicating via this site you and I and the rest of the gang here are employing a myriad of devices and systems that are not presently built or operated in a sustainable way. What some of us may be able to say is that we try to be mindful of those occasions as are available-- in the context we find ourselves living-- which afford choices regarding making more or less of a mess. Come to think of it, your demand for pledges of sustainability is rather curious. What is it that you think "people on this site" profess? I'm wondering, do you believe that subscribing to mainstream physics and the scientific method in general is some sort of statement of moral superiority? Perhaps I misunderstand, though.
  22. Hi to JMurphy: I would be pretty miffed if my doctor had lung cancer and continued to smoke. to doug_bostrom the amount of activity this site has means that people are really bothered by this issue(s) and I would have thought that people would want to take further, bigger action towards sustainablility than just writing on web site and I am wondering if this is the case.
  23. Hapivibe @ 44 - Destruction of the rainforest which is needed for species diversity Destruction of the rainforests will also negatively impact the climate. The Amazon alone has between 86 to 93 billion tonnes of carbon locked up in it's vegetation and soils. Our oceans are being overfished And acidified too, from the combustions of fossil fuels. Which will affect fish populations at some point. So, as you can see, these issues aren't mutually exclusive.
  24. Hi dappled water I know the issues are not mutually exclusive - I am proposing that they get overshadowed.
  25. hapivibe wrote : "I know the issues are not mutually exclusive - I am proposing that they get overshadowed." And what is the basis for your proposal ? In what way do you think those issues are being overshadowed ? Is money, effort, etc. being taken away from those issues in some quantifiable way ? What's your evidence ? By the way, my previous analogy of the doctor telling you about cancer or the health-damaging effects of smoking (while being a smoker him/herself) did not involve HIM/HER having lung cancer - it involved them telling you about the detrimental effects on your life from smoking, especially if it had caused YOU to develop cancer. Would you ignore/disregard that doctor's opinion or diagnosis just because that doctor was doing something that he/she is advising you not to (anymore) ?

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