How does it know?
Apparently Media Matters said so.
Popular Science reports:
Climate change is a major contributing factor to wildfires, like the blaze in Arizona that killed 19 firefighters this week. But is that connection being made in news reports?
A new Media Matters report examined how frequently recent print and TV reports from major outlets–CNN, NBC, The New York Times, Washington Post, and others–mentioned climate change when they reported on wildfires. The answer: not very frequently. Between April and July, just 4 percent of TV reports and 9 percent of print reports mentioned climate change in their fire coverage.