"Star Trek was an attempt to say that humanity will reach maturity and wisdom on the day that it begins not just to tolerate, but take a special delight in differences in ideas and differences in life forms."

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The number of people displaced by dams is estimated at between 40 million and 80 million, most of them in China and India. The costs of dams were on average 50% above their original estimate. Some designed to reduce flooding made it worse, and there were many unexpected environmental disadvantages, including the extinction of fish and bird species. Half the world's wetlands had been lost because of dams.

— Paul Brown