Biden said he and his wife Jill Biden continue to pray for those affected by the historic wildfires in the western part of the United States that have killed at least 35 people, displaced thousands and burned millions of acres.
It's a different story in Portland, Seattle, and San Francisco - now the worst air quality of any big cities in the world.
Trump visited McClellan Park, a former U.S. Air Force Base about 10 miles outside Sacramento that is used by firefighters as a staging area for large aircraft used in combating blazes. In addition to Gov. Gavin Newsom, a string of other federal state and city officials were in attendance.
As Newsom toured a ghostlike landscape destroyed by flames Friday, he called out the "ideological BS" of those who deny the danger.
What role is climate change playing? "Just come to the state of California, observe it with your own eyes", he said.
Most of the fatalities have occurred in California and OR, with emergency services in the two states recording 26 deaths. And it had back-to-back heat waves.
As of September 14, the wildfires have already burned over 2.2 million acres of land in California with almost 14,000 firefighters battling 25 major wildfires that have collectively destroyed 3,300 structures, eight people and untold numbers of wildlife, livestock and housepets.
"This is truly the bellwether for climate change on the West Coast", she said Sunday on CBS' "Face the Nation".
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"We need a president who respects science, who understands that the damage from climate change is already here", added Biden, who was speaking in Delaware. White House adviser Peter Navarro echoed that Sunday on CNN's "State of the Union", saying that for many years in California, "particularly because of budget cutbacks, there was no inclination to manage our forests". The initiative aims to reduce wildfire risk for 500,000 acres of forest land per year. For example, pushing the US energy sector to eliminate carbon emissions from power plants by 2035 would mean corresponding expansion in jobs in the solar energy sector.
"You're the reason they're setting fires up here", she said, perhaps referring to false rumors that left-wing activists had sparked the wildfires.
The wildfires have destroyed property, running up huge losses for property insurers and put a strain on economic activity along the West Coast that could linger for a year or more.
Thick smoke and ash from the fires has darkened the sky over the Pacific Northwest since Labour Day, creating some of the world's worst air-quality levels and driving residents indoors.
At least 10 people have been killed in OR in the past week.
He said: "There are going to be a number of fatalities, folks that just couldn't get warning in time and couldn't evacuate their homes and get to safety".
Wine Spectator, however, has reported that one winery in the Rogue Valley AVA in OR has been destroyed in the Alameda fire, a blaze in the south of the state that has claimed the lives of four people.
Community donation centres popped up around Jackson County over the weekend, including one in the parking lot of Home Depot in Phoenix, where farmers brought a pick-up truck bed full of watermelons and people brought water and other supplies.
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