Described in the April edition of Future Survey as "the authoritative global document for the moment", the Intergovernmental Panel on Climate Change's Third Assessment Report has parts available online. The Synthesis Report (8Mb PDF) and its Summary for Policymakers (300Kb PDF) include lots of graphs that both look back over centuries of climate change and provide several scenarios of change for the century ahead.
See also a US government agency's National Assessment of the Potential Consequences of Climate Variability and Change and an in-depth United Nations report linked to here a while ago.
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