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“Despite the broad range of ecosystem functions and services provided by tropical ecosystems, society has reduced the value of these ecosystems to just one metric—carbon,” write the authors, led by Jesús Aguirre-Gutiérrez of the Environmental Change Institute at the. “Current and new policy should not promote ecosystem degradation via tree plantations with a narrow view on carbon capture.
It’s often assumed that tree planting for carbon capture also benefits biodiversity and enhances socioeconomic benefits, but the authors argue that this is usually not the case. Tropical ecosystems are highly biodiverse, and they provide multiple ecosystem services, such as maintaining water quality, soil health, and pollination.
And tropical grasslands and savannahs are already carbon sinks. When intact, tropical grasslands and savannahs store large quantities of carbon below ground. In contrast to carbon-capture tree plantations, which predominantly store carbon above ground, these below-ground carbon sinks—which would be lost if afforested—are less susceptible to disturbances such as drought and fire.
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