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Here the answer will depend on what is meant by 'significant' -- and whether 'human activity' should include urbanization, land changes, agriculture, irrigation, deforestation, etc. Many might answer 'Yes' – even if they don't think that GH gases are a significant factor in climate ch...
The experts say their research does not undermine the scientific consensus that emissions of greenhouse gases from human activity drive global warming, but they call for "closer examination" of the way climate computer models consider water vapour.
Fri, Jan 29 | from The Guardian (UK)