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POPSHow Darwin won the evolution race Thoughts of money or women might have filled lesser heads. Alfred Russel Wallace was made of different stuff, however. He began thinking about disease and famine; about how they kept human populations in check; and about recent discoveries indicating that the earth's age was vast. How might these waves of death, repeated over aeons, influence the make-up of different species, he wondered?
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POPSThe power and the glory The market for energy is huge. At present, the world’s population consumes about 15 terawatts of power. (A terawatt is 1,000 gigawatts, and a gigawatt is the capacity of the largest sort of coal-fired power station.) That translates into a business worth $6 trillion a year—about a tenth of the world’s economic output—according to John Doerr, a venture capitalist who is heavily involved in the industry. And by 2050, power consumption is likely to have risen to 30 terawatts.
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