Why should we avoid using plastic bags or throwing them in water bodies or on the road?

Why is the load of biodegradable material dangerous to the water bodies ?

Why should we wear cotton clothes in summer?

We know that many human activities lead to increasing levels of pollution of the air water bodies and soil . Do you think that isolating these activities to specific and limited areas would help in reducing pollution ?

Why should the metal sulphides and carbonated ores be converted to metal oxides in the process of extraction of the metal from them?