The US presidential envoy says the King can 'leverage' the action needed to tackle global warming.
But Mr Kerry said he "very much" hopes the King will continue to push the arguments for radical action to tackle climate change "within the constitutional process".
"He's been consistently on this issue, beginning in his teenage years and carrying on in many different iterations and he's for real, believe me.Mr Kerry said the King had discussed wanting to be "relevant and try to be engaged" and that he hoped he would continue to be active on environmental issues.
He has spoken in recent months about the impact of the war in Ukraine on efforts to limit global heating to 1.5C by 2030 - with countries facing the simultaneous challenges of sourcing alternatives to Russian gas supplies while also needing to cut their CO2 emissions.
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