Here's a new, hitherto unsuspected and unforeseen major sign of climate change.
http://science.nasa.gov/science-news/science-at-nasa/2012/08jun_arcticbloom/
June 8, 2012: Scientists have made a biological discovery in Arctic Ocean waters as unexpected as finding a rainforest in the middle of a desert. A NASA-sponsored expedition named ICESCAPE punched through three-feet of sea ice to find waters richer in microscopic marine plants, essential to all sea life, than any other ocean region on Earth.