[简答题] Using Land Wisely A very important world problem—in fact, I am inclined to say it is the most important of all the great world problems which face US at the present time—is the rapidly increasing pressure of population on land and on land resources. It is not so much the actual population of the world but its rate of increase which is important. It works out to be about 1. 6 per cent per annual net increase. In terms of numbers this means something like forty to fifty-five million additional people every year. Canada has a population of twenty million-rather less than six months’’ climb in world population. Take Australia. There are ten million people in Australia. So, it takes the world less than three months to add to itself a population. Let the US take our own crowded country -England and Wales: forty -five to fifty million people—just about a year’’s supply. By this time tomorrow, and every day, there will be added to the earth about 12

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