Choose the best answer:
We are using up the world‘s petroleum. We use (1) _________in our cars and to heat our building in winter.Farmers use petrochemicals to (2) _________ the soil rich. They use them to kill insects (3) _________eat plants. These chemicals go (4) __________rivers and lakes and kill the fish there. Thousands of pollutants also go into the air and pollute it. Winds carry this (5) _________ air to other countries and other continents. Poor farmers use the same land over and (6) __________ 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 (7) _________ firewood. In some areas when the trees are gone, the land (8) _________ desert. Poor people can‘t save the environment for the (9) ___________ This is not a problem for one country or one area of the world. It is a problem for allhumans. The people and the nations of the world must work together to (10) ___________ the world‘s resources

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