At a meeting of the American Geophysical Union, British environmental photojournalist Jenny Ross described scenes of an adult polar bear killing a bear cub in the Arctic, another disturbing result of loss of sea ice due to climate change. A paper describing the kill event was recently published in the journal Arctic. More photos here. Warning: graphic.
"There are increasing numbers of observations of it occurring, particularly on land where polar bears are trapped ashore, completely food-deprived for extended periods of time due to the loss of sea ice as a result of climate change."