San Francisco Chronicle: Emperor penguins and chicks in Antarctica are the most severely threatened by impending climate changes, the report says. The birds need solid sea ice to lay eggs and raise chicks on. Shifting sea ice around Antarctica is already disrupting penguin colonies as the world’s climate warms, according to a new report by a team of polar scientists. The researchers looked at the complex relationship between emperor and Adelie penguins and their changing habitats and studied how a …