US President Donald Trump has said that he will visit California amid deadly wildfires and will meet the heads of California’s emergency services on Monday. The fires have destroyed more than 3.2 million acres in the state this year, with nearly four months of fire season yet to come.

In recent weeks, Trump has made little comments about the blazes. “They never had anything like this,” Trump said. “Please remember the words, very simple, forest management.”

Also read: As wildfires rage, US voters still divided on climate

However, his presidential challenger Joe Biden has said that the cause of such record fires is much broader than it seems. 

“The science is clear, and deadly signs like these are unmistakable — climate change poses an imminent, existential threat to our way of life,” he said.

“President Trump can try to deny that reality, but the facts are undeniable,” Biden added.

Worsening the sense of environmental catastrophe, all five of the world’s most air-polluted cities Saturday were on the West Coast, according to IQAir, with dense smog and ash coating the atmosphere from Los Angeles up to Vancouver in Canada.

A 56-year-old woman Joy, who is sheltering outside Portland, told AFP, “We saw a bird that was flying and then all sudden it just completely dropped out of the sky… if it’s killing God’s creatures, I don’t want to die too. So we left.”

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In California, Butte County Sheriff Kory Honea said that additional officials had been brought in to check for human remains, but “right now, the areas that we need to search are too hot.”

More than 20,000 firefighters are battling the wildfires in the US. The raging blazes have now killed more than 30 people in the West Coast and burnt nearly 5 million acres of land, an area roughly the size of New Jersey.