In the Paris accord, 195 countries agreed that they would collectively keep average global temperatures from rising more than 2 degrees. But what does science have to say on how fast, and by how much, will we have to cut our emissions to get there? Professor Kevin Anderson of the Tyndall Centre is a climate scientist who looks at exactly this question. And the math he comes away with, isn't pretty.
Kevin Anderson shares his thoughts on what will need to happen if we are to meet the declarations in Paris, why it's a matter of justice that we act, and why he personally has made the difficult decision to give up air travel.