US President Donald Trump has dismissed concerns over climate change on a visit to fire-ravaged California, telling an official "I don't think science knows" about global warming.

"It'll start getting cooler, you just watch," Mr Trump said after he was urged not to "ignore the science".

Blazes in several states have burned vast areas of land and killed at least 36 people since early August.

Scientists say human activities have driven up global temperatures.

But Mr Trump has blamed poor forest management for the fires that have burned almost 2 million hectares (5 million acres) of land in California, Oregon and Washington state.

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