The 20th century's 10 warmest years all occurred in the last 15 years of the century. Of these, 1998 was the warmest year on record. Snow cover in the Northern Hemisphere & floating ice in the Arctic Ocean have decreased. Globally, sea-level has risen 4-8 inches during the past century. Worldwide precipitation over land has increased by about one percent.

Increasing concentrations of greenhouse gases are likely to accelerate the rate of climate change. Scientists expect that the average global surface temperature could rise 0.6 - 2.5 degree Celsius in the next 50 years and 1.4 - 5.8 degree Celsius in the 21st century, with significant regional variation.

Evaporation will increase as the climate warms, which will increase average global precipitation. Sea level is likely to rise two feet along most of the U.S. coast.

Sources: US National Climate Data Center
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