Climate Impacts

In mid-November, California canceled the opening of its Dungeness crab fisheries, the latest in a series of closures up and down the U.S. West Coast this summer and fall linked to an unusually widespread bloom of toxic algae that thrives in warm waters.

October 2011

  • In the mid-1980s, the winter sea ice pack in the Arctic was dominated by multi-year ice—ice that had survived at least one summer melt. Today, less than half of the sea ice at winter maximum has survived at least one summer.

  • The low ice extent recorded this September continued the downward trend seen over the last 30 years. Meanwhile, scientists are finding that the ice cover has grown thinner, making it more vulnerable to melting during the summer.