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the using of the earth’s resources the control over the waste of the natural materials how to slow down the increase of population how to stop the birth of new babies
is; doesn’t are; don’t are; doesn’t is; don’t
city pollution population pollution countryside pollution industry pollution
detain continue contain maintain
Many countries are making rules to fight pollution. The pollution of the earth grows as fast as the world's population does. If people could go to work by bus or bike instead of car or motorbike it would be helpful in fighting against the problem of SO2. The problem of pollution is not so serious because there are not so many people living on the earth.
350 million 25,000 million 4,000 million 7,000 million
the using of the earth’s resources the control over the waste of the natural materials how to slow down the increase of population how to stop the birth of new babies
is; are is; has been are; is is; was
city pollution population pollution countryside pollution industry pollution
because the earth is being polluted day and night thanks to science development because of the rise in population because the earth is blown away by the wind every years
nature' s own pace is slowing down rapidly the "working capital" of recycled material has all been used up the earth' s resources cannot be replaced by man the earth' s growing population requires more and more resources
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