Each year, the Earth’s trees suck more than a hundred billion tons of carbon dioxide from the atmosphere. That’s an impossibly huge number to consider, about 60 times the weight of all the humans currently on the planet.
Our forests perform a cornucopia of services: Serving as a stabilizing force for nearly all of terrestrial life, they foster biodiversity and even make us happier. But as climate change accelerates, drawing that carbon out of the air has become trees’ most critical role.
Absorbing CO2 is key in a time where each year matters greatly to our ability to avert the worst effects of climate change: Carbon “sinks,” like the wood of trees and organic matter buried in dirt, prevent the gas from returning to the atmosphere for dozens or even hundreds of years. Right now, about a third of all human carbon emissions are absorbed by trees and other land plants — the rest remains in the atmosphere or gets buried at sea. That share will need to rise toward and beyond 100 percent in order to counter all of humanity’s emissions past and present.