Marchers at the People’s Climate March in New York in September 2014. (Photo: Annette Bernhardt/flickr/cc)

For years, environmentalists have called for an urgent response to runaway climate change. Evidence has poured in from around the world to corroborate Hansen’s conclusions, from melting glaciers, sea level rise and ocean acidification to increasing extreme weather events and changes in animal and plant behaviour and ranges.

I’ve been astounded by the lack of response to climate change over the years, but I’ll go out on a limb and suggest a shift is now taking place. Although we may not recognize its significance without the benefit of hindsight, we appear to be in the early stages of something huge.

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