Carbon dioxide and methane trapped in tiny bubbles of air in ancient ice down to 3,200 metres (10,500 ft) below the surface of Antarctica add 150,000 years of data to climate records stretching back 650,000 years from shallower ice drilling.
"We can firmly say that today's concentrations of carbon dioxide and methane are
28 and 124 percent higher respectively than at any time during the last 800,000
years,"
Greenhouse gases are at higher levels in the atmosphere than at any time in at
least 800,000 years, according to a study of Antarctic ice on Wednesday that
extends evidence that mankind is disrupting the climate.
The U.N. Climate Panel last year blamed human activities, led by burning of fossil fuels that release heat-trapping gases, for modern global warming that may disrupt water and food supplies with ever more droughts, floods and heatwaves.
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