The math is simple. Humans are cutting down 15 billion trees a year and replanting only 9 billion, creating an annual net loss of 6 billion trees. Planting trees by hand is time consuming and expensive, making it difficult to keep up with bulldozers clear-cutting over 40 football fields of trees ever minute. We’ve had impressive efforts, such as India planting 66 million trees in a day, but that was a large-scale event, which required organizing millions of volunteers. It would be difficult to recreate something like that on a regular basis.
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