The Dictionary of the Climate Debate (DCD)


IPCC Fourth Assessment Report
Definition: (Aka AR4)

Entitled Climate Change 2007, this was the fourth in the series of IPCC reports intended to assess scientific, technical and socio-economic information concerning climate change, its potential effects, and options for adaptation and mitigation (for the others, see FAR, SAR, and TAR).

It was the most detailed summary of the climate change ever, involving thousands of authors.

A key finding

In a nutshell, it said that earth's average surface temperature was definitely rising, and that it was 90% likely that this rise is due to AGW:

"Warming of the climate system is unequivocal. … Most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations."



The BBC reports its release



Notes:
1. Click here to read the Summary for Policymakers.

2. Click here to read Real Climate's summary and assessment of the Summary.

3. Click here for PDF versions of all AR4 documents.


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