Present emission trends are putting the world on a path toward 4°C warming within this century. The effects of such warming would not be evenly distributed around the world, nor would the consequences be simply an extension of those experienced at 2°C warming. A 4°C world would be one of unprecedented heat waves, severe droughts, and major floods in many regions, with serious impacts on human systems, ecosystems and associated services.

Projections for a 4°C warmer world show:

  • A dramatic increase in the intensity and frequency of high-temperature extremes.
  • Dry areas generally becoming drier and wet areas wetter.
  • The extinction of entire coral reef ecosystems due to a 150% increase in ocean acidity.
  • Sea-level rise of .5 to 1 meter by the end of this century.

About arnulfo

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