Millions of species of plants, animals and other living things populate earth. This variety of life is called biodiversity. A number of species are extinct or on the verge of being extinct due to human activities like:
Deforestation causes loss of habitat for various animals and plant species.
Air pollution causes acid rains. When acid rainwater enter seas and oceans, it harms the aquatic life.
Overhunting of animals causes serious reduction in the population of animal species.