The continued addition of greenhouse gases to the atmosphere is likely to raise the earth’s average temperature by several degrees in the next century, which will in turn raise the level of the sea. Most of the United States is expected to warm, although sulfates may limit warming in some areas. Scientists currently are unable to determine which parts of the United States will become wetter or drier, but there is likely to be an overall trend toward increased precipitation and evaporation, more intense rainstorms, and drier soils.
Global Temperature
Since 1979, scientists have generally agreed that a doubling of atmospheric carbon dioxide increases the earth’s average surface temperature by 1.5-4.5°C (3-8°F). More recent studies have suggested that the warming is likely to occur more rapidly over land than the open seas.
Sea Level
The warmer temperatures are expected to raise sea level by expanding ocean water, melting mountain glaciers, and melting parts of the Greenland Ice Sheet.
U.S. Climate
Scientists generally agree on the likely rise in the average global temperatures over the next century. Unfortunately, projecting the change in particular regions is more difficult. Nevertheless, there is a general consensus that temperatures will warm throughout the United States.
