If people (a)   (share) their cars to go to work, there won't be so many car fumes

If we only use the water we need, we (a)   contribute to our planet's recovery.

If everybody (a)   (continue) to use aerosols and CFCs, the hole in the ozone layer will get bigger

If you use spotlights savers, you (a)   (pay) less light.

Lots of animals (a)   perish if we destroy rainforests.

(a)   we recycle paper products like newspapers and books, we can save more trees on earth.

What (a)   (happen) when we do not conserve water?