Explained: Radiative forcing

When people talk about global warming or the greenhouse effect, the main underlying scientific concept that describes the process is radiative forcing. And despite all the recent controversy over leaked emails and charges of poorly sourced references in the last Intergovernmental Panel on Climate Change report, the basic concept of radiative forcing is one on which scientists -- whatever their views on global warming or the IPCC -- all seem to agree. Disagreements come into play in determining the actual value of that number.

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