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The best time to plant a tree was twenty years ago. The second best time is now.”
-Marshall Lyautey
The value of a tree economically speaking over a 50 year lifetime:

Generates #3,1250 worth of oxygen,

Provides $62,000 worth of pollution control,

Recycles $37,500 worth of water,

Controls $31,250 worth of soil erosion.

(source Michigan State University

and you can cut them up and make some fast boats!