Pollution is the introduction of harmful substances or energy into the environment. It can affect the air, water, land, and climate. 

What causes pollution? 

Car exhaust

Factory smoke

Littering

Dumping solid waste in water bodies

Disposing untreated industrial sewage into water bodies

Human and animal wastes

Agricultural runoff containing pesticides and fertilizers

What are the effects of pollution? 

Pollution can make people sick and harm animals and plants

Pollution can reduce the health of ecosystems

Pollution can alter the natural carbon reserve cycle

Pollution can increase the global average temperatures

Pollution can cause glacier melting, thermal expansion of the oceans

So we need to stop pollution