Climate Science Glossary

Term Lookup

Enter a term in the search box to find its definition.


Use the controls in the far right panel to increase or decrease the number of terms automatically displayed (or to completely turn that feature off).

Term Lookup


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.

Home Arguments Software Resources Comments The Consensus Project Translations About Support

Bluesky Facebook LinkedIn Mastodon MeWe

Twitter YouTube RSS Posts RSS Comments Email Subscribe

Climate's changed before
It's the sun
It's not bad
There is no consensus
It's cooling
Models are unreliable
Temp record is unreliable
Animals and plants can adapt
It hasn't warmed since 1998
Antarctica is gaining ice
View All Arguments...

New? Register here
Forgot your password?

Latest Posts


2017 SkS Weekly Climate Change & Global Warming News Roundup #22

Posted on 4 June 2017 by John Hartz

A chronological listing of news articles posted on the Skeptical Science Facebook page during the past week. 

Editor's Pick

Carbon Dioxide Set an All-Time Monthly High

With May in the books, it’s official: carbon dioxide set an all-time monthly record. It’s a sobering annual reminder that humans are pushing the climate into a state unseen in millions of years.

Carbon dioxide peaked at 409.65 parts per million for the year, according to data from the National Oceanic and Atmospheric Administration. It’s not a surprise that it happened. Carbon dioxide levels at Mauna Loa Observatory in Hawaii peak in May every year.

CO2 Emissions Jan 2012 thru May 2017 

The news comes one day after President Trump announced his plan to pull out of the world’s main climate agreement, juxtaposing the severity of the problem with an administration that has shown little to no interest in addressing it.

While plants growing in the northern hemisphere will draw a few parts per million of the carbon dioxide out of the atmosphere over summer, make no mistake, human pollution is pushing atmospheric carbon dioxide ever higher. Mauna Loa Observatory crossed the 410 ppm threshold for the first time in recorded history in April. The May average is almost exactly what UK Met Office scientists predicted it would be in their first carbon dioxide forecast.

Carbon Dioxide Set an All-Time Monthly High by Brian Kahn, Climate Central, June 2, 2017

Links posted on Facebook

Sun May 28, 2017

Mon May 29, 2017

Tue May 30, 2017

Wed May 31, 2017

Thu June 1, 2017

Fri June 2, 2017

Sat June 3, 2017

0 0

Printable Version  |  Link to this page


Comments 1 to 6:

  1. So where is all this CO2 coming from ? The IEA keeps reassuring us and folk like Stefan Rahmstorf use this data to suggest athrophogenic emisions have 'flatlined' for the last three years, for example here.. is it we're being misled about anthro emisions, as suggested here backed up by a real world example here ? or are sinks finally giving their CO2 up ie old anthro CO2 emissions coming back to haunt us, we have no El Nino to blame 

    0 0
  2. Trevor_S @1, CO2 emissions from the combustion of fossil fuels have indeed flatlined:

    That does not include emissions from cement manufacture, and nor does it include emissions from LUC.  It is, therefore, quite possible that total anthropogenic emissions have continued to rise.  (Certainly emissions from cement manufacture are likely to have done so.)

    More importantly, a plateau in emissions still means anthropogenic CO2 in the atmosphere is increasing.  A plateau will only mean the increase is at a constant rate rather than at an accelerating rate as has been the case prior to 2014.

    Finally, the three years of the fossil fuel emissions plateau have also, each set a new Global Mean Surface Temperature record.  With higher temperatures comes a reduced rate of absorption of CO2 by the ocean, and consequently a rise in CO2 concentration.  This factor will average out with slower rises in concentration in likely neutral or La Nina years in the near future.

    0 0
  3. Some good news in that data though. The annual increase is half that of the previous year, and a levelling off of global CO2 emissions means that the projected annual percentage increase will continue to decelerate. 

    0 0
  4. When you denude a forest you release tons of Carbon .... when you plow fields you release tons of Carbon .... However the largest increase is likely due to thawing tundra and the release of CO2 trapped in ice that's now gone. 

    It's a classic positive feedback mechanism only this time it run in reverse with CO2 leading and Temperature following whereas under natural conditions the Temperature leads and the CO2 levels follow as tundra thaws and releases Carbon. The Feedback mechanism works as such More CO2 = more warming which causes more CO2 to be released which causes even more warming which causes even more CO2 to be released .... Lather rinse repeat until you go into a runaway feedback condition AKA Tipping Point or something catastrophic happens such as a large meteor strike or a shift in the Earth's axis to make break the feedback loop and lower temperatures

    0 0
  5. Not quite:

    "With the more realistic physics in the Russell model the runaway water vapor feedback that exists with idealized concepts does not occur. However, the high climate sensitivity has implications for the habitability of the planet, should all fossil fuels actually be burned.

    Furthermore, we show that the calculated climate sensitivity is consistent with global temperature and CO2 amounts that are estimated to have existed at earlier times in Earth's history when the planet was ice-free.

    One implication is that if we should "succeed" in digging up and burning all fossil fuels, some parts of the planet would become literally uninhabitable, with some time in the year having wet bulb temperature exceeding 35°C.

    At such temperatures, for reasons of physiology and physics, humans cannot survive, because even under ideal conditions of rest and ventilation, it is physically impossible for the environment to carry away the 100 W of metabolic heat that a human body generates when it is at rest. Thus even a person lying quietly naked in hurricane force winds would be unable to survive.

    Temperatures even several degrees below this extreme limit would be sufficient to make a region practically uninhabitable for living and working.

    The picture that emerges for Earth sometime in the distant future, if we should dig up and burn every fossil fuel, is thus consistent with that depicted in "Storms" — an ice-free Antarctica and a desolate planet without human inhabitants"


    So no runaway. But Hansen notes that it won't take a runaway to basically completely eradicate civilization as we know it.

    Further, unlike the simple example of positive feedback we learned in high school, the increase from every round of feedback gets smaller and smaller, in the case of the enhanced greenhouse effect. It is a significant factor in the overall warming, but it does NOT lead to a "runaway" trajectory for temperature.



    0 0
  6. #1
    There is a clear misconception among many that its the INCREASE in fossil fuel emissions that is causing CO2 to increase.  However, if tomorrow emissions were cut in half, it simply means the year over year increase in CO2 would decline to about 1 ppm/yr from 2 ppm/yr.  That's because, correct me if I'm wrong, burning coal and oil and nat'l gas is not part of the natural carbon cycle when viewed in human time frames.  So there is only a small connection to El Nino.  Test this by removing the El Nino and La Nina years from the data and noting that not much changes in the past 50 years.  The Keeling curve remains pretty steady.

    0 0

You need to be logged in to post a comment. Login via the left margin or if you're new, register here.

The Consensus Project Website


(free to republish)

© Copyright 2024 John Cook
Home | Translations | About Us | Privacy | Contact Us