Consider the fact that the average Western European uses half as much energy as the average American (and hence produces half as much CO2). Half is a big proportion, especially when you consider that it comes not from any new technology but instead from somewhat different social arrangements. Europeans have decided to, say, invest in building cities that draw people in instead of flinging them out to sprawling suburbs, and invest in mass transit that people then actually take. This kind of investment may produce quicker returns than high-tech R&D; at the very least, it's urgently important that these kinds of societies (where reported rates of human satisfaction are sharply higher than in the US) be held up to China, India, and the rest of the developing world, in place of our careening model. In addition, given that we will certainly be facing a disrupted planet, tighter human communities are probably a better bet for "surviving and thriving" than bioengineering to achieve different kinds of bodies.
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