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【科学60秒】地球的胃口有多大？嗯……
听力简介：
“It took until about 1800 or 1825 to put the first billion people on the planet.We added the most recent billion in 12 or 13 years.We _____1_____ two billion more by 2050.”
That’s Joel Cohen, head of the Laboratory of Populations at Rockefeller University in New York.He spoke February 20th at the annual meeting of the American Association for the Advancement of Science in Washington, DC.So how many people can the earth hold?
“In the last half century, people have _____2_____ human carrying capacities for the earth that _____3_____ less than one billion to more than a trillion.They can’t all be right.In fact, those numbers are political numbers, not scientific numbers.Because the question how many people can the earth support is an incomplete question, and doesn’t _____4_____ what technologies, at what average level of well-being, with what _____5_____, with what political and economic institutions.”
【视听版科学小组荣誉出品】
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