Rickover recommended a course of action that would swing the human race over to renewable energy while conserving remaining carbon resources in the limited but sufficient time remaining.

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Wambach and company spent much of the match balancing a pair of ambitions: winning and conserving energy for the Olympic knockout round.

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Research at the smart cities center, she said, will include smart thermostats "that learn our personal needs and habits and adjust themselves, " conserving energy.

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During these lean months, they don't go into caves but rather experience a "walking hibernation, " eating very little and conserving their energy.

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Inside the lodges, trekkers rest up ahead of their final climb, conserving their strength and yet still burning energy just trying to breathe and function at such an altitude -- at 4, 800m, oxygen levels are only about 55% of those at sea level.

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By making our homes more efficient and conserving on automotive fuel use, we could theoretically save 40 percent or more on our total energy consumption.

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