Greg Callaghan's September 2020 feature story, "Global Warning", tracks the links from Australia's unprecedented summer of hell through to California’s current fires. Greg then chats with one of Australia's most outspoken firefighters, former NSW Fire and Rescue commissioner, Greg Mullins, along with eminent American fire historian Stephen Pyne, who coined the term “pyrocene” to describe this age of fire.

Discussion starts at 19:15. 

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