Trump's climate views may change: Kerry

US Secretary of State John Kerry has told an international climate change conference he can't speculate on President-elect Donald Trump's climate policies but that his views might change once he is in office.

Trump has called climate change a hoax, and said he would rip up the 2015 Paris deal, halt any US taxpayer funds for UN global warming programs, and revive the US coal sector.

"While I can't stand here and speculate about what policies our President-elect will pursue, I will tell you this: In the time that I have spent in public life, one of the things I've learned is that some issues look a little bit different when you're actually in office compared to when you're on the campaign trail," Kerry said on Wednesday.