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MINUTES into Jon Shenk and Bonni Cohen’s tub-thumping sequel to Oscar-winning 2006 documentary An Inconvenient Truth, it becomes apparent that there is one renewable energy source the world has yet to harness.

It is a steady, irresistible thrum that won’t destroy the ozone layer, and could power the planet for decades: former United States Vice President Al Gore’s boundless determination to prick consciences about the effects of global warming.

Gore loudly bangs a drum for action and words on climate change, spreading his message during a turbulent period of political upheaval including the election of Donald Trump, who withdrew the US from the Paris climate accord.

“With all these new threats, there’s Canadian Prime Minister never been a Justin Trudeau and Al Gore at more important the UN Climate Conference time to speak truth to power,” Gore sombrely observes, providing a snappy subtitle for the sequel.

Like its predecessor, the film incorporates segments from Gore’s slide-show lectures, which have been updated with scenes from Typhoon Haiyan in the Philippines and flooding in Florida, the state which famously denied him the keys to the White House in the 2000 presidential election against George W Bush.

Breathtaking footage of the statesman atop a rapidly

melting glacier in Greenland is intercut with snappy soundbites that anoint Gore as the lone voice of reason capable of deviating us from self-destruction. “Big money has so much influence now,” he laments. “Our democracy has been hacked.” Nowhere in...