Climate Change 2001:
Working Group I: The Scientific Basis
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E.7 Remaining Uncertainties in Detection and Attribution

Some progress has been made in reducing uncertainty, though many of the sources of uncertainty identified in the SAR still exist. These include:

E.8 Synopsis

In the light of new evidence and taking into account the remaining uncertainties, most of the observed warming over the last 50 years is likely to have been due to the increase in greenhouse gas concentrations.

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