New Scientist: Try not to faint from shock. The controversial Keystone XL pipeline, which would carry Canadian oil through the US, will make climate change worse. It will boost global emissions of carbon dioxide by up to 110 million tonnes per year. The finding will step up the pressure on US president Barack Obama to stop the pipeline being built.
That extra CO2 is not a huge amount on a global scale. "But it is a step in the wrong direction," says Jerry Schnoor of the University of Iowa in Iowa City, who was...