Last week, the leader of the most powerful country in the world called climate change "the greatest con job ever perpetrated on the world".

Donald Trump's speech to the United Nations General Assembly was full of blatant falsehoods, attacking clean energy, proclaiming coal is clean and beautiful, and that predictions of global warming have been wrong.

Veteran environmentalist Bill McKibben described it as "the dumbest speech in UN history".

"Climate scientists are long used to weird denialism, but Trump is next level," McKibben wrote.

" Evidence, data, and expert analysis bounce off his bronzed hide like tennis balls off a rhino. "

Trump's claims aren't new; they come from a well-worn playbook of climate denial and delay, often spread by those with vested interests in slowing down

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