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1) The construction of buildings and roads in the Yangtze basin is increasing at a staggering pace.2) The basin is now home to 400 million people With the average household in China consisting of fewer than four people a population of 400 million means 100 million housing units.4) The human pressure on the land is intense.5) And land hunger is forcing more and more homes to be built on the land once covered with the forests.