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Keeling Curve

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Keeling Curve

Charles David Keeling's measurements provided the first significant evidence of increasing atmospheric carbon dioxide concentration in the atmosphere.

It’s Official: 2012 is Hottest U.S. Year on Record

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It’s Official: 2012 is Hottest U.S. Year on Record

A snapshot of how 2012 stacks up against the five other warmest years ever recorded in the U.S.

2012 Global Carbon Emissions

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2012 Global Carbon Emissions

Human-generated emissions of CO2 this year are expected to reach 35.6 billion tons. That’s up 2.6 percent from what was emitted in 2011, the previous record holder.

Global Warming Coastal Flood Risk

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Global Warming Coastal Flood Risk

The odds of extreme coastal floods nationally by 2030.

The Age of Man: A New Geologic Epoch

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The Age of Man: A New Geologic Epoch

Recent human activity is having such a significant environmental impact on the planet that we may be entering a new geologic epoch, known as the Anthropocene.

20 Big U.S. Cities that Should Worry About Sea Level Rise

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20 Big U.S. Cities that Should Worry About Sea Level Rise

A new study highlights 180 regions in the U.S. where sea level rise is likely to have a major impact. Here are photos of the 20 cities with populations over 300,000 which are likely to be affected.

Geoengineering Methods

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Geoengineering Methods

From snatching carbon dioxide (CO2) out of the air like trees do, to launching giant mirrors into space, scientists are researching a wide variety of technologies to artificially slow global warming.

US Fossil Fuel CO2 Emissions

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US Fossil Fuel CO2 Emissions

CO2 emissions from fossil fuel have been growing steadily in the US and are projected to continue growing until 2030 and beyond if no legislation is passed to reduce emissions.