How to keep the environment clean.

How to keep the environment clean.
Pollution is one of the great problems of modern life. Modern means of transport enable man to travel comfortably and fast to any part of the world. Yet, trains, buses, trucks, cars, ships and aeroplanes pollute the air with the smoke that comes out of their exhaust pipes and chimneys full of carbon dioxide and lead oxides. Moreover, they cause sound pollution with their sirens, horns and the noise of their engines.
In order to reduce the pollution and keep the environment cleaner, scientists made researches and produced fuels without lead additives. New laws are issued banning using harmful chemicals in food production. By not using hormones, chemical fertilizers or poisonous insecticides in agriculture, pollution will be decreased. Planting more trees and fixing efficient filters to industrial factory chimneys will help purify the air and keep the environment clean.
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