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Ecology is the science of how living things are related to their environ-ment. Many people all over the world are concerned about the ecology today. The word "ecology" came from the Greek which means "home". This idea of "home" includes the whole planet of ours. We must protect our planet from lit-tering, air pollution, water pollution, destruction of natural resources.
We know that polluted air, land and water are harmful to plants, animals and people. Many territories, lakes, rivers, seas, oceans and the atmosphere are polluted with all kinds of technological, chemical, nuclear and other wastes. Awful harm is caused to our home by nuclear tests, atom bombs and accidents on the atomic power stations.
How can we keep our earth clean?
Don't buy drinks in plastic bottles. These bottles can't be recycled and plastic won't even de-grade. If you throw this bottle, it will still litter the earth for ever. Only buy water and other drinks in aluminium cans or glass bottles. Buy milk and juice in cartons. Glass, aluminium and carton can be recycled.
The energy saved from one recycled aluminium can will operate a televi-sion set for three hours. If you throw an aluminium can out of the train window, it will still litter the earth up to 500 years later. If you throw the glass bottle you litter the earth for ever.
It takes 500 000 trees just to make the newspapers we read every Sunday. Save your family newspapers. Find out how to recycle newspapers in your area. Most paper thrown away in the office just has printing on one side. So you can use the blank side for writing or drawing.