A canopy of trees is the natural ecosystem in much of the world. Trees are very efficient in capturing available sunlight, and because they are resilient to weather extremes over centuries. Growing trees that produce useful crops is a compromise between conserving natural patterns of nature for ecological stability, and favoring species of plants that produce food useful to people.
If they covered the earth, trees would absorb much of the earth’s excess CO² for 50-100 years, buying the world time to mitigate and adapt to the effects of climate change.
The Green Center 
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