If I had only one wish for the next 50 years," said Bill Gates, "it would be to invent the thing that halves the cost of carbon dioxide." The founder of Microsoft went on: "We must innovate our way to zero CO2 emissions."
Gates is thinking like an entrepreneur: he knows there are profits to be made from developing an energy technology that is half as expensive as drilling for carbon-based fuels. But he is also thinking like an environmentalist: he knows the globe can't bear the ecological cost of spewing more and more carbon dioxide into the atmosphere.
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