Global warmists are hard pressed for some good evidence these days. The satellite temperature readings aren’t showing a warming trend. Ocean buoys indicate the ocean is slightly cooling. The antarctic ice has reached record extent. Only the "adjusted" temperatures provided by NASA provide some comfort.
The best hope for some good evidence lies in the summer ice melt in the arctic. There are a lot of bets being placed on the arctic ice melt.
Polar experts are starting to place their bets on the fate of the thin veneer of sea ice on the Arctic Ocean, and quite a few are forecasting even more open water this summer than last. Mark Serreze at the National Snow and Ice Data Center pointed me to their latest sea-ice projection, posted on Monday, and told me he sees “a decent chance that the North Pole melts out” this year. Ignatius G. Rigor, an ice expert at the University of Washington, agrees. In an e-mail, he said he’s putting his (research) money where his mouth is “by buying a few dozen buoys that are meant to be deployed in open ocean.” Source:http://dotearth.blogs.nytimes.com/2008/05/07/science-on-shrinking-north-pole-ice/
Here is a great vantage point for watching the arctic ice race. This graphic shows the extent of arctic ice over the last several years. The yellow line shows the record dip in ice coverage last summer. The orange line shows the current ice coverage. Will the orange line dip down to join the yellow line?
This graphic is updated regularly from this site. July will be a crucial time as people everywhere will be watching how fast the ice melts.
Incidentally, the extent of the summer melt does not affect the polar bear. Polar bears are on land from July to November in any event.