The billionaire Andrew Forrest, the C.E.O. of the global mining company Fortescue and the richest person in Australia, laid out his vision for a fossil-free future and the role he thinks heavy industry, green hydrogen and private capital must play in helping us arrive there.

He also challenged President Trump to witness the ways climate change is transforming Australia: “As a fellow businessman, I happen to own several million acres of land in Australia. Come and see what’s happening to my land.”

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