It's the final hours of the UN Bali climate conference, and it looks like delegates will be up all night. Hope remains that they can overcome the US government's obstructionism.

But no matter what they end up with in Bali, they canna' change the laws of physics. This week, two new scientific revelations brought that home again: 2007 was shockingly warm and the arctic could be virtually ice free by 2012.

From the BBC:

This year has been one of the warmest since 1850, despite the cooling influence of La Nina conditions, according to scientists.

The UK's Hadley Centre and University of East Anglia conclude that globally, this year ranks as the seventh warmest.

From ABC News:

"The Arctic is screaming," said Mark Serreze, senior scientist at the government's snow and ice data center in Boulder, Colo.

Just last year, two top scientists surprised their colleagues by projecting that the Arctic sea ice was melting so rapidly that it could disappear entirely by the summer of 2040.

This week, after reviewing his own new data, NASA climate scientist Jay Zwally said: "At this rate, the Arctic Ocean could be nearly ice-free at the end of summer by 2012, much faster than previous predictions."

Our only chance is to stop dumping so much carbon dioxide into the air - less coal, less oil, more renewable energy and energy efficiency. We need a road map to binding cuts in CO2, and our team on the ground isn't going to sleep until it's done. Read their updates from the conference.