求翻译：If the population of the Earth goes on increasing at its present rate, there will eventually not be enough resources left to support life on the planet. One possible solution to the problem has recently been suggested by an American scientist, Professor Carl Sagan: he believes that before the Earth's resources are completely used up it will be possible to change the atmosphere (大气圈) of Venus (金星) and so create a new world almost as large as the Earth itself. The difficulty is that Venus is much hotter than the Earth and has only a tiny amount of water.是什么意思？

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