“I assume we will have figured out a way to efficiently utilize solar energy and tied that to an efficient way to use nuclear energy in such a way that it doesn't pose a serious environmental issue.”
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Is there some risk every day we walk out our front door? Every time we get in our car? Yeah. Are we materially less safe now than we were 10 years ago? Whatever delta there is, it's very small.
In the environmental movement, every time you lose a battle it's for good, but our victories always seem to be temporary and we keep fighting them over and over again.
Nature is not simply a technical or economical resource, and human beings are not mere numbers. To suggest that one can somehow align all the squabbling institutions of science, environmental management, government and diplomacy in an alliance of convenience to regulate the global climate seems to me optimistic.
I really believe in the environmental movement right now - it only takes a little effort to make a big difference.