National Geographic: Up to 75 percent of major Antarctic penguin colonies may disappear if climate change continues to heat up the continent, according to a recent report. A global temperature increase of 3.6 Fahrenheit (2 degrees Celsius) above pre-industrial levels will result in widespread changes to sea ice that the birds depend on for survival. The temperature increase will, in any scenario, lead to a major reshuffling of colonies of emperor and Adélie penguins–the two penguin species that …