How Trees Cause Pollution
Backyard trees may not accomplish much, but forests soak up vast amounts of carbon. In fact, some people argue that trees and native plant communities may be one of our best remedies for climate emissions. Unfortunately, forests not only store a lot of carbon, they can also emit a lot carbon.
Take California's redwood country, for example. Data from the North Coast Air Basin shows astonishing carbon emissions from a typical year of forest fires in just three counties. Enough, in fact, to equal 367,000 average American cars on the road. And this in a region with just 167,000 souls.
Here's the down-low. Experts estimate that forest fires in Del Norte, Humboldt, and Trinity Counties were responsible for more than 1.8 million tons of carbon-dioxide over the decade from 1994 to 2003. Not only that, but fires kicked out more than 56,000 tons of methane, which is roughly 23 times as climate-potent as carbon-dioxide. All that adds up to nearly 2 million tons of carbon-dioxide-equivalent climate pollution. (Major hat tip to Lynn Jungwirth, who emailed me the data.)
Of course, the emisions from fires is really only half the story of forests. It's debits, but not the credits. Northern California's forests stored carbon during that period too ("sequestered" it, as they say in the biz). Just how much? Well, it's hard to be certain. And that's part of the problem.
