# when we use pesticides and fertilizers the get dissolved in rain water which falls on plants and on the land the water flows to the ponds or lakes ..which increases the pH level of water and making the aquatic animals hard to live .
# we cut down trees and clear out the foresters causing the animals to disappear , become extinct.
# our huge industries and factories emit the harmful gas and cause acid rains thus harming animals.
# we throw the garbage and the left out chemicals from the factories without purifying them into the rivers and lakes , which kills the aquatic animals .
# chemical reactions involving air pollutants create a poisonous gas ozone (o3). the ozone gas can affect people's health and can damage vegetation types and some animal life loss .
hope it was useful . happy pongal/sankranthi :)