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AN ICE bridge which had apparently held a vast Antarctic ice shelf in place during recorded history shattered on Saturday and could herald a wider collapse linked to global warming, a leading scientist said.

An unusually high proportion of thinner 'first year' ice in the Arctic raises the prospect of an acceleration in the loss of ice during the warmer summer months

The draft measure, written by Representatives Henry A. Waxman of California and Edward J. Markey of Massachusetts, sets a slightly more ambitious goal for capping heat-trapping gases than Mr. Obama's proposal. The bill requires that emissions be reduced 20 percent from 2005 levels by 2020, while Mr. Obama's plancalls for a 14 percent reduction by 2020. Both would reduce emissions of carbon dioxide, methane and other greenhouse gases by roughly 80 percent by 2050.

From Colorado to Washington state, an unprecedented, years-long epidemic of mountain pine beetle has killed 2.6 million hectares (6.5 million acres) of forest. The insect has struck even more devastatingly to the north, in British Columbia, where clouds of beetles have laid waste to 14 million hectares (35 million acres) - twice the area of Ireland. It is expected to kill 80 percent of the Canadian province's lodgepole pines before it's finished. Farther north, in the Yukon, the pine beetle isn't endemic - yet. Here it's the spruce bark beetle that has eaten its way through 400,000 hectares (1 million acres) of woodland, and even more in neighboring Alaska, in a 15-year-old epidemic unmatched in its longevity and extent.

Though simultaneously praising the 2-degree commitment as "clearly a big step forward" in international talks, IPCC Chairman Rajendra Pachauri told reporters here yesterday that G-8 leaders failed to heed warnings that global greenhouse gas emissions levels must peak by 2015. Nations must also start to come up with concrete plans for rapidly slashing emissions afterward, Pachauri said.