Despite their work, Flannery said there was still not enough leadership to combat climate change.

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“The leaders I spoke to all really had one common experience: they’d all realised that unless they act – and we act – we could lose something extremely precious, which is our stable environment that’s nurtured us ever since we’ve been on the planet,” he said.

“Losing that means threatening our civilisation, a really big decline in the quality of life for people around the planet, food shortages [and] a catastrophic impact on biodiversity.”

After the federal election last year, Flannery declared that climate action was the undisputed winner. Not only had the Albanese government won office but “millions of voters put climate first at the ballot box”, which brought to power independents and other candidates committed to tackling climate change.

More than a year on, Flannery said the government looked set to honour the climate pledges made before the election, but this was not enough.

“What we’re hoping is that we will be able to meet all those pledges and if they go into a second term, we’ll have a much-deepened level of commitment to dealing with things,” he said.

Flannery hopes the documentary will inspire viewers to become more active in combating climate change.

“I really hope that there’s a certain proportion of people in the audience who will realise what’s at stake and ask themselves deeply what would it take for me to be a climate leader, how can I do that in my business or my community or my church or my sports group or my political party?” he said.

“And we’ll get a deepening of commitment where people will actually make this the priority.”