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Last updated on April 17, 2014 at 17:30 EDT

Latest Chris Field Stories

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2010-07-15 11:55:00

According to a study of prehistoric climate change, ancient hunters who stalked the world's last woolly mammoths likely helped warm the Earth's far northern latitudes thousands of years before humans started to burn fossil fuels. Researchers at the Carnegie Institution for Science decided that the demise of the leaf-chomping woolly mammoths contributed to a proliferation of dwarf birch trees in and around the Arctic, darkening a largely barren, reflective landscape and accelerating a rise in...

2010-07-01 16:33:15

Even before the dawn of agriculture, people may have caused the planet to warm up, a new study suggests. Mammoths used to roam modern-day Russia and North America, but are now extinct"”and there's evidence that around 15,000 years ago, early hunters had a hand in wiping them out. A new study, accepted for publication in Geophysical Research Letters, a journal of the American Geophysical Union (AGU), argues that this die-off had the side effect of heating up the planet. "A lot of people...

2009-02-17 15:15:28

A U.S. scientist says Earth's atmospheric greenhouse gases are increasing more rapidly than expected, resulting in worsening global warming predictions. Chris Field, a member of the Nobel Prize-winning Intergovernmental Panel on Climate Change, says decisive action is needed to prevent the planet's climate system from crossing a critical threshold by the end of the century. Field, director of the Carnegie Institution's Department of Global Ecology, said studies indicate greenhouse warming...

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2009-02-15 07:45:00

According to a top climate scientist, warnings about global warming have not been severe enough. Just over a year ago, the Nobel-winning Intergovernmental Panel on Climate Change (IPCC) issued a report warning of expanding deserts, intense storms, rising sea levels, and an extinction of up to 30 percent of animals and plants due to global warming. A recent study suggests that the report underestimated the severity of climate change over the next century, says a senior member of the IPCC. "We...