What are the main causes of thermal pollution?

What are the causes of water pollution ?

In the metropolitan cities of India, many children are suffering from allergy/asthma. What are the main causes of this problem. Give some symptoms of allergic reactions.

What are the main sources of pollution in Mumbai?

What is pollution?

What are the sources of water pollution ?

What is the effect of thermal pollution?

What are the sources of phosphate pollution of water?

What is main cause of flood ?