New Scientist: Fat chance then. Even with all the green power we muster, preventing dangerous climate change by the end of the century is “barely feasible”. So says an analysis of how fast low-carbon energy sources can be introduced. For a 50:50 chance of keeping a global temperature rise within 2 °C by 2100, we must halve emissions by 2050. This is the message of climate models by Keywan Riahi of the International Institute for Applied Systems Analysis in Laxenburg, Austria, and colleagues. That …