Hum,
Current levels of the greenhouse gases carbon dioxide and methane in the atmosphere are higher now than at any time in the last 650,000 years.
BBC Science correspondent David Shukman is currently embedded with the British Antarctic survey team at the Rothera Research Station and has been producing a number of reports for BBC News.
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Scientists say they have found the first direct link between melting Antarctic ice and an increase in greenhouse gases.
The British Antarctic Survey (BAS) has been studying air bubbles trapped in the ice on Adelaide Island on an Antarctic Peninsula .
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