We are using up the world’s petroleum. We use it in our cars and to heat our building in winter. Farmers use petrochemicals to make the soil rich. They use them to kill insects (i) _______ eat plants. These chemicals go into rivers and lakes and kill the fish there. Thousands of pollutants also go into the air and pollute it. Winds carry this (ii) _______ air to other countries and other continents. Poor farmers use the same land over and over. The land needs a rest so it will be better next year. However, the farmers must have food this year. Poor people cut down forests (iii) _______ firewood. In some areas when the trees are gone, the land becomes desert. Poor people can’t save the environment for the (iv) _______ . This is not a problem for one country or one area of the world. It is a problem for all- humans. The people and the nations of the world must work together to (v) _______  the world’s resources.

(iii)_____-

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