Greenhouse Effects

Global warming is well under way. Here are some telltale signs

Carbon dioxide and other gases from the burning of fossil fuels collect in the atmosphere and act like the glass walls of a greenhouse, trapping heat on the earth's surface. Scientists predict that the planet's average temperature could rise as much as 6.3[degrees]F (3.5[degrees]C) over the next century, and we are already seeing heat waves, melting polar ice and rising seas. Local impact remains unpredictable: some areas could suffer stronger storms and other places severe drought. Seven environmental groups--Environmental Defense Fund, Natural Resources Defense Council, Sierra Club, Union of Concerned Scientists, U.S. Public Interest Research Group, World Resources Institute and World...

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