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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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A Scientific Guide to the 'Skeptics Handbook'

The Skeptics Handbook asks "what evidence is there that more CO2 forces temperatures up further?" It then lays out 4 arguments: the greenhouse signature is missing, CO2 lags temperature, it's not warming and the CO2 effect is saturated. The great irony of the 'Skeptics Handbook' is when you examine these 4 arguments and the full body of empirical evidence that goes with them, what you actually find is the evidence that human CO2 emissions are causing global warming. The guide is freely available as an A5 PDF or printable A4 PDF that can be folded into an A5 booklet.

The human fingerprints on climate change

The Scientific Guide examines 4 human fingerprints on climate change. Click on any fingerprint for more detailed information.

Cooling stratosphere/warming troposphere
As CO2 stops heat from reaching the upper atmosphere, we expect to see a warming lower atmosphere and cooling upper atmosphere.
Less heat is escaping to space
Satellites measure more heat being trapped by CO2. Combined with ice core records, this is evidence for positive feedback.
Nights warming faster than days
The number of warm nights are increasing faster than warm days. This is another effect of greenhouse warming.
More heat returning to Earth
Confirming the satellite data, surface measurements find more heat returning to Earth.

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Many thanks to all those who generously donated their time to translate the Scientific Guide into other languages.

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