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Tall and old or dense and young: Which kind of forest is better for the climate?

  • Scientists say reforestation and better forest management can provide 18 percent of climate change mitigation through 2030. But studies appear to be divided about whether it’s better to prioritize the conservation of old forests or the replanting of young ones.
  • A closer look, however, reconciles these two viewpoints. While young forests tend to absorb more carbon overall because trees can be crowded together when they’re small, a tree’s carbon absorption rate accelerates as it ages. This means that forests comprised of tall, old trees – like the temperate rainforests of North America’s Pacific coast – are some of the planet’s biggest carbon storehouses.
  • But when forests are logged, their immense stores of carbon are quickly released. A study found the logging of forests in the U.S. state of Oregon emitted 33 million tons of CO2 – almost as much as the world’s dirtiest coal plant.
  • Researchers are calling on industry to help buffer climate change by doubling tree harvest rotations to 80 years, and urge government agencies managing forests to impose their own harvest restrictions

Read the full article by Paul Koberstein & Jessica Applegate at Mongabay

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