It's a year since President Trump was elected.

In that time he has appointed a climate sceptic as head of the Environmental Protection Agency, he has insisted that he will bring the coal industry back, and he still has not appointed a science advisor.

Roger Harrabin travels to the USA to meet those spearheading the resistance to President Trump's climate policies.

In California he meets Governor Jerry Brown. Jerry is determined that California pushes ahead towards a cleaner future. He visits the world's largest battery storage plant near San Diego, and travels to the San Gorgonio Pass, the site of one of the world's largest wind farms.

Heading east from California to Ohio, and coal country, Roger meets Bob Murray, head of the Murray Energy Corp. Bob is determined to see coal jobs protected, but even he believes that coal's heyday has passed, but he remains bullish.

Roger also meets form science advisor to President Obama, Dr John Holdren. John thinks that economics should ensure that the USA remains on a path to cleaner energy.

Producer Martin Poyntz-Roberts.