Guest: Seth Klein, founder of Climate Emergency Unit

Fighting climate change is the existential crisis of our times. Why can't we seem to coordinate en masse the same way we have with other crises of massive scale? When Canada entered World War Two in 1939, the country radically transformed its economy and its very society in a matter of months. In fact at its peak, one in 11 Canadians was directly employed in military production—and a similar number was actively fighting.

Seth Klein is a lifelong activist, the founder of the Climate Emergency Unit and the author of "A Good War: Mobilizing Canada for the Climate Emergency." He argues the same type of mass mobilization needs to take place in this country to combat climate change.