What Is Climate Change? - University of Colorado Boulder

PERSPECTIVES. ROGER A. PIELKE, JR. What Is Climate change ? Believe it or not, the Framework their differing definitions of cli- Convention on Climate change mate change . The FCCC defines (FCCC), focused on international Incompatibility Climate change as a change of cli- policy, and the Intergovernmental mate that is attributed directly or Panel on Climate change (IPCC), between the indirectly to human activity, that focused on scientific assessments definitions used by alters the composition of the global in support of the FCCC, use dif- atmosphere, and that is in addition ferent definitions of Climate science and policy to natural Climate variability over change . The two definitions are organizations is comparable time periods. By con- not compatible, certainly not po- trast, the IPCC defines Climate litically and perhaps not even sci- an obstacle to change broadly as any change in entifically. This lack of coherence effective action. Climate over time whether due to has contributed to the current in- natural variability or as a result of ternational stalemate on Climate human activity.

Conference of Parties to the FCCC, held December 1 to 12, 2003, in Milan, Italy, which took place amid uncertainty about whether the ... climate change, there is precious little room for uncertainty about the climate future; it is either dan-gerous enough to warrant action or it is not. Claims about the exis-

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