If light pollution __________ (keep) growing, you ____________ (not be) able to see even the Big Dipper at night.
keeps - won't be
If I ___________ (be) the President, I _________ (ban) billboards in cities in order to reduce visual pollution.
was / were - would ban
If we use public transport more, we _______ (help) reduce air pollution.
will help
If we ____________ (not recycle) paper now, we'll need to cut down more trees in the future.
don't recycle / do not recycle
Soil / not / be / so / polluted / if / farmers / not use / much / chemical / fertilizer.
Soil wouldn't be so polluted if farmers didn't use much chemical fertilizer.
If / there / be / no / war, people / live / more / happy
If there was / were no war, people would live more happily.
If / I / be / his mother/, I / ask / tidy / room / every day.
If I was / were his mother, I would ask him to tidy the room every day.
If we recycle more household waste, there __________ (be) less damage to the environment.
will be
More / tourist / come / here / if / beach / be / cleaner
More tourist would come hear if the beach was / were cleaner.
The amount of plastic in the ocean __________ (increase) if we __________ (not take) action now.
will increase - don't take
If / I / be / you, I / plant / vegetables / garden.
If I was / were you, I would plant vegetables in the garden.
What / happen / if / there / be / no / car / world?
What would happen if there were no cars in the world?