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Proving global warming
A world of evidence
NATACHA PISARENKO / AP
The evidence: melting glaciers
Ice falls from the Perito Moreno Glacier in Patagonia, Argentina, where the melting rate of ice fields has doubled in recent years. Glaciers around the world are retreating, a sign, scientists say, of global warming.
The cause: man-made pollution
Carbon-dioxide levels are at their highest in 650,000 years — and probably 2 million years. About a third of the man-made carbon dioxide in the U.S. comes from cars. The rest is from factories, power plants and home and commercial heating.
GARY BRAASCH-KPA / ZUMA KPA
The future: drowning islands
Facing more frequent floods, residents of Tuvalu in the South Pacific threatened to sue the United States over global warming that has raised the worldwide sea level by 8 inches and could swamp the tiny nation by 2050.