TABLE 1 Relationship of Atmospheric Concentrations of Carbon Dioxide to Temperature

perature increases. This is done by scaling local to global warming and by “coupled linkages” that show how other climate changes, such as alterations in the water cycle, scale with temperature.

There is now increased confidence in how global warming levels of 1ºC, 2ºC, 3ºC etc. (for ºF conversion, see Figure Syn.2) would relate to certain future impacts. This report lists some of these effects per degree (ºC) of global warming (see Figure Syn.3), including:

  • 5-10 percent changes in precipitation in a number of regions

  • 3-10 percent increases in heavy rainfall

  • 5-15 percent yield reductions of a number of crops

  • 5-10 percent changes in streamflow in many river basins worldwide

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