If we plant more trees, the air will be fresher.
If we use fewer cars, we will reduce pollution.
If we cycle to school every day, we will keep fitter.
If we use recycled products, we will save money.
If people throw rubbish into the right bin, they will keep the environment clean.
If we turn off the tap when brushing our teeth, we will save a lot of water.  
If people travel more by public transport, the harmful gases in big cities will be reduced.
If we start at 6:00, we will arrive there before noon.  
If the boy eats so many green apples, he will be ill.
If we use reusable bags for shopping, we will reduce waste.  
6 Sentences About Making Our Environment Greener
Here are six sentences about things we should or shouldn't do to make our environment greener:
We should reduce our consumption of single-use plastics.
We should recycle paper, glass, and metal regularly.
We should use public transport, cycle, or walk instead of driving cars whenever possible.
We shouldn't waste electricity by leaving lights and appliances on when they are not needed.
We should plant more trees and support reforestation efforts.
We shouldn't pollute rivers and lakes with harmful chemicals.