The Third Assessment Report of Working Group I of the Intergovernmental Panel on Climate Change (IPCC) has released this summary for policymakers (approved in Shanghai in January 2001), describing the current state of scientific understanding of the climate system. The report, available in .pdf format, provides considerable scientific evidence that warming is occurring across the globe and that "emissions of greenhouse gases and aerosols due to human activities continue to alter the atmosphere in ways that are expected to affect the climate."
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