One of the two programs that monitor greenhouse gases said that it had revised a reading suggesting that carbon dioxide had surpassed the symbolic level of 400 parts per million.
The amount of the gas in the air has not been this high for at least three million years, and scientists believe the rise portends large changes in the climate and sea level.
Coastal development has soared, and this rush toward the sea is the biggest factor in the rising costs of storm bailouts.
Scientists say the rapid melting of the Quelccaya ice cap, the world’s largest tropical ice sheet, is the latest sign of global warming.
James E. Hansen, a longtime NASA scientist, retires this week and plans to pursue even greater political and legal efforts to limit greenhouse gases.
While scientists race to develop a technology, probably nuclear-based, that can slake our energy thirst without a huge environmental cost, it would be folly to wait that long to tackle carbon emissions.
The modern warming period is unique over a longer period than previously thought, according to research published in the journal Science.
A paper published by the journal Science suggests that the sharp warming that ended the last ice age occurred in lock step with increases in carbon dioxide.
A new working paper suggests that modest efforts to tackle climate change are not enough to protect the world’s food supply.
Researchers delve into why some climate skeptics are quick to latch onto conspiracy theories rather than merely express doubts.
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