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Environmental regulations are being systematically weakened and repealed by the US government.

Justin Rowlatt speaks to someone trying to keep track of it all - Michael Gerrard of Columbia Law School. He also hears from Maria Caffrey, a climate scientist who lost her job at the US National Park Service after blowing the whistle about how her research was being suppressed - and she says she is not the only one.

Climate sceptic Myron Ebell of the Competitive Enterprise Institute explains why the environmental rollback is good news for the US economy, while climate futurist Alex Steffen says humanity will be the living with the consequences of Trump's delay of climate action for generations to come.

With Democratic challenger Joe Biden having unveiled an unprecedentedly ambitious climate plan, it means there is all to play for in the November Presidential elections.

Producer: Laurence Knight

(Picture: Donald Trump holds up a "Trump Digs Coal" sign at an event in Huntington, West Virginia; Credit: Saul Loeb/AFP via Getty Images)