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1. there (be) fewer cars / (be) less air pollution
If there are fewer cars, there will be less air pollution
air pollution (get worse) / trees (be) cut down
Air pollution will get worse if trees are cut down
we (not use) plastic bags / they (not go) into the ocean
If we don't use plastic bags, they won't go into the ocean
we (breathe) dirty air / there (be) air pollution
We will breathe dirty air if there is air pollution
urban sprawl (continue) / cities (become) too big
If urban sprawl continues, cities will become too big
we (build) more roads / more animals (lose) their homes
If we build more roads, more animals will lose their homes
