A conversation with the climate ministers of Canada, Chile and the U.K.

Three lead negotiators at COP15 once held their governments to account in climate science and advocacy, and are now working on the inside. Matt Galloway talks to Canada's Minister of the Environment and Climate Change Steven Guilbeault; the U.K.’s Minister for International Environment and Climate Zac Goldsmith; and Chile’s Minister of the Environment Maisa Rojas.