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Explain elaborately why "We don't inherit earth from our ancestors; we borrow it from our children."

As we command and consume the resources of the earth, all that we reap is what our children will not be able to reap.  Every redwood that is cut down is borrowed from our progeny.  Every barrel of oil we take from the ground is a barrel of oil our children will be unable to use.  Every acre of woods that we built a McMansion on is an acre of land that the next generation cannot enjoy. The destruction of the rain forest is a borrowing from our offspring, not only its destruction, but also potential cures not yet found.  As we continue in this manner, it may very well be that we are not simply borrowing this earth, but that we are making it impossible for the next generation to use it at all.  If we were to begin to behave as caretakers of the earth for our children, we would have something to hand down.  What we borrow now can never be paid back - or forward.

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