- The Associated Press claims that “science says” global warming
increases the area of western U.S. land scorched by wildfires every
year.
- Climate scientist Cliff Mass noted AP’s simple correlation is not “science” and misses other key drivers of fires.
- It’s similar to another report from early August also attempting to link wildfires to global warming.
The
Associated Press is out with an analysis claiming that “science says”
the amount of western U.S. land scorched by wildfires every year
increases as temperatures go up. However, while those things are
true, simply correlating two data trends is not “science,” as AP writer
Seth Borenstein claims. And one expert says the simple correlation is
meant to suggest a strong relationship between global warming and
western wildfires that might not be there. “This is not science,” University of Washington climate scientist Cliff Mass told The Daily Caller News Foundation. The AP’s analysis found the “five years with the most acres burned since 1983 averaged 63.4 degrees from April to September,” which is “1.2 degrees warmer than average and 2.4 degrees hotter than the years with the least acres burned.” Since 1999, “10 years have had more than 10,000 square miles burned, including 2017, 2015 and 2006 when more than 15,000 square miles burned,” the AP found. “Nationally, more than 8,900 square miles have burned this year, about 28 percent more than the 10-year average as of mid-August.”
However, the simple correlation between temperature and wildfires is meant to play into a broader media narrative that global warming is the main driver of fires, but Mass noted that other factors, including land management, play an important role.
“Correlation is not causation,” Mass said. “Temperatures are warming, that is true. Wildfire area in increasing in parts of the west, also true. But one does not necessarily cause another.” “Wildfire area could well be increasing because of previous fire suppression, mismanagement of our forests, and a huge influx of people into the west, lightning fires and providing lots of fuel for them,” Mass said.
Most fires are human-caused, including 95 percent of fires in California, according to recent research. Sparks from vehicles, chainsaws and generators can set off massive blazes, as can power lines colliding with dried-out vegetation. Arson is the cause of many fires.
As the population of the West spreads into fire-prone landscapes, so does the risk of human-caused fires. Wildfire season is longer and more widespread in part because of an increased human presence in areas already prone to burning.
“I should note that there is a deep literature for California fires showing a very weak correlation between summer temperatures and wildfires,” Mass said. “If Borenstein had written up his ‘study’ and submitted it for publication, it would have been quickly rejected.”...
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