The earth is one, but the world is not, we all depend on one biosphere for sustaining our lives.

一个地球多重世界，但我们赖以为生的生物圈还是一个。

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The global environment consists of the atmosphere, the hydrosphere and the lithosphere in which the life-sustaining resources of the earth are contained.

全球环境由大气圈、水圈和岩石圈所组成，其中包含了维系地球上生命的资源。

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Another friend of mine used to maintain that airplanes stayed up in the air only because people believed -- against reason -- that they could fly: Without that collective delusion sustaining them, they would instantly plummet to earth.

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