According to a new investigation of the greenhouse gas’s role in ice ages over the millennia, Carbon dioxide in the earth’s atmosphere has risen to its highest level in at least 2.1 million years.

The famous oceanographer Sylvia Earle has won the 2009 TED prize for her inspirational work at the frontier of deep ocean exploration for four decades.Earle has led more than 50 expeditions worldwide involving more than 6,000 hours underwater. As captain of the first all-female team to live underwater, she and her fellow scientists received a ticker-tape parade and White House reception upon their return to the surface. In 1979, Sylvia Earle walked untethered on the sea floor at a lower depth than any other woman before or since.

In an attempt to break the political deadlock preventing action on GHG emissions from international shipping and aviation, Australia has called for reduction targets for these sectors to be agreed at the Copenhagen climate talks in December.

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