Inter Press Service: A coalition of environmental groups sued the George W. Bush administration Monday for delaying a decision to protect polar bears threatened with extinction due to the melting ice in its Arctic habitat. Polar bears could be the first species officially threatened by climate change. The huge loss of summer sea ice in 2007 has caused many scientists to project that the Arctic could be ice-free in summer by as soon as 2012. Although excellent swimmers, polar bears are not very good …