In September, President Donald Trump visited fire-ravaged California and declared that the wildfires that had already burned across millions of acres were the result of forest mismanagement, not a warming climate. “When trees fall down after a short period of time, they become very dry — really like a matchstick. No more water pouring through, and they can explode,” he said. “Also leaves. When you have dried leaves on the ground, it’s just fuel for the fires...”