Jenny E Ross of the US has won the first prize in the Nature Singles category of the World Press photo contest 2011 with this picture. It shows a male polar bear climbing precariously on the face of a cliff above the ocean at Ostrova Oranskie in northern Novaya Zemlya, Russia, attempting to feed on seabird eggs. This bear was marooned on land and unable to feed on seals - its normal prey - because sea ice had melted throughout the region and receded far to the north as a result of climate change (via The week in wildlife – in pictures | Environment | guardian.co.uk)