Why do people protecting forests care about protecting air, water, soil?

All people on our planet use fresh water. We need water every day for cooking, drinking, washing, etc. If our reservoirs are polluted, then fish and all living creatures that live in these reservoirs may die. And also pollution of water bodies can cause illness and death of people who use this water.
It is necessary to protect water bodies from the dumping of waste from enterprises, from household waste, from wastewater, and it is also important to reduce the thoughtless use of water and remember that its stocks are finite.