We're too many people; that's why we have global warming...on a voluntary basis, everybody in the world's got to pledge to themselves that one child is it.
It's going to cost trillions of dollars to rework the energy sources all over the world. Were going to have to move away from fossil fuels.
The next most dangerous thing [after nuclear proliferation] is probably... global warming, and then, right behind that are overpopulation -- we need to get serious about family planning-and trying to alleviate poverty, to get clean, renewable energy, probably with solar panels to the billion and a half people in the world who don't have access to electricity.
I had more energy at 50. On the other hand, at 75, I've probably got a little more wisdom and good judgment than I had at 50 because I've got more experience. But I haven't really changed. I'm still driven by the same philosophy.
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