What shouldn`t people do to protect environment.write 2-3 things. please

Factories shouldn't dump harmful wastes in rivers, seas and oceans. And people shouldn't throw garbage into waters. 
Factories shouldn't make dumps in forests and fields because a contamination of the soil leads to the fact that the plants which are grown in this soil can be poisoned and dangerous for people. Those dumps also kill many animals every day.
We shouldn't be so many cars in the world because it's bad for air.
We shouldn't use so much water every day because if we don't, shortly, there won't be any fresh water at all because if we do keep doing this, soon, there won't be any fresh water at all.