Opportunity Cost, definition of

The cost of an economic activity foregone by the choice of another activity.

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• Climategate, what is going on?
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• Solar Panels for your home, with the reduced feed-in tariff, are they a sound investment?
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  An independent review said the scientists who produce the periodic United Nations reports on climate change (IPCC) should be more open to alternative views, more transparent about their own possible conflicts of interest and more realistic in the reporting of the likelihood of climatic events.