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What We Know For Sure Watch Video

Videos - States of Change

What We Know For Sure

No scientist disputes that carbon dioxide is a greenhouse gas and that it is increasing in the atmosphere. And careful detective work shows that the increase has chemical fingerprints — from us.

Georgia: Coal and Carbon Watch Video

Videos - States of Change

Georgia: Coal and Carbon

Coal generates carbon dioxide when combusted, which is causing the world to warm. In Georgia, a state that gets over 60 percent of its electricity from coal, some coastal residents are connecting the dots between coal and changes in the local ecology and economy attributed to global warming.

Iowa: Corn and Climate Watch Video

Videos - States of Change

Iowa: Corn and Climate

Congress helped bolster the corn ethanol business in Iowa by mandating the Renewable Fuel Standard in 2005. But scientists are concerned about the unexpected consequences of putting more of Iowa's land into corn production.

Montana: Trout and Drought Watch Video

Videos - States of Change

Montana: Trout and Drought

Montana's recreational fishing and agricultural industries depend on cool waters flowing from melting snow high in the mountains throughout the summer. But across Montana, rising temperatures are causing a series of changes.

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New York: July Days Over 90 Degrees By mid-century in New York, the sweltering heat of July 2010 may be thought of as cooler-than-average conditions

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