Because when
the environment has been destroyed and there's no place
that the "damn" trees will grow [...]
I think you really have no idea
how difficult it is to destroy the
environment to the extent that you propose.
Quite easy; indeed, it's almost been done, or the things wouldn't be
endangered.
Remember, "environment" means the whole environment, including (eg)
humans, not just things like weather and soil with all the other issues
wished away. To put it another way, trees grow very poorly in the
presence of humans who consider survival of the trees as a species of
small value compared to having the land cleared.
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