1. If industries (not / increase) releasing greenhouse gases into
the atmosphere, the greenhouse effect (start) to build up.
2. If humans (release) fewer CFCs into the atmosphere, the
ozone layer (become) depleted.
3. If humans (not / cut down) so many trees for fuel, they (release)
so much pollution into the air.
4. If humans (not / cut down) so many trees, the forests (absorb)
more carbon dioxide by now.
5. If rain and snow (not / start) mixing with acids, the problem
of the acid rain (not / appear).
6. The humans (make) such a great impact on the environment
if they (produce) such an amount of greenhouse gases.

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