In her first report since joining the W5 team, Investigative Reporter Avery Haines delivers "The Big Thaw", uncovering the climate change disaster unfolding in the Canadian Arctic with melting permafrost releasing ancient viruses, bacteria, and carbon gases. Haines interviews environmental scientists and permafrost experts to give viewers a front row seat on the devastating effects of climate change in Canada, how this growing climate disaster is affecting Canada’s Indigenous and Northern communities, and how changes to our permafrost are escalating into a major global concern.

Originally broadcast as part of the CTV television series W5.