News bites: Climate change pushed Vikings out of Greenland, research says

TransCanada shut down its massive Keystone pipeline because of a small oil leak in Kansas. The leak comes amid renewed attention on the project, as TransCanada is seeking approval for an even bigger pipeline that will stretch from Alberta, Canada, to Texas.

China could reduce its energy intensity by 20 percent when compared to 2005 levels, a new report says.

Climate change is partly responsible for food prices that could double in the next 20 years, a new report says.

Climate change pushed the Vikings out of Greenland, new research shows.

Fast Company takes a look at the cities that are best prepared to deal with climate change.