Invasive species kill enough trees each year to release as much carbon into the atmosphere as 4 million cars.
, a bright-green beetle originally from Asia whose bark-munching larvae have killed hundreds of millions of trees in the U.S. since the species was discovered stateside in 2002.
The researchers calculated tree mortality rates in pest-free areas, and then compared them to the rates in infested areas to determine the toll taken by the pests. On average, just more than 1 percent of trees in the U.S. die each year. The study showed that close to 3.5 percent died in ash borer-infested areas. For areas infested with other pests, like the laurel wilt fungus that infects laurel trees, more than 11 percent of trees died over the course of a year.
The consequences of such widespread devastation would extend far beyond the loss of valuable woodland habitat, according to Fei. “We think about forests as one of the major solutions for climate change,” he said. “When these trees are being damaged by these insects, they become dead materials. When they become dead materials, they not only stop working for you, they release CO2 back into the atmosphere.
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