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Dodd Stacy's avatar

Mr. McKibben,

I offer this criticism of your solar vs nuclear analysis from the perspective of a retired R&D mechanical engineer and a Viet Nam era instructor at the US Navy Nuclear Power School. Our NH home has been powered by fixed PV arrays for more than a decade and is heated by heat pumps, our sole vehicle is an EV, I hold a US patent on a self-pumped solar water heating system, and I just replaced my last remaining gas-powered device - a snow blower - with a battery machine (although our changing winters make its future utility questionable).

Your analysis infers equivalence between global daily installation of 1 gigawatt of solar power and construction of a 1 gigawatt nuclear power plant. In each case, the power rating indicates the maximum instantaneous power the facility can deliver - at high noon on a sunny day for the solar case. Because our turning earth whisks the solar site past the sun's rays, the array captures only about 4 gigawatt-hours of useful energy each day, whether that energy is used immediately or time shifted with battery storage to meet energy demand as it occurs. The nuclear plant meanwhile can perk along at 1 gigawatt of power output all day long, delivering 24 gigawatt-hours of energy, 6 times the useful output of the "equivalent" solar installation. Discussing and comparing technologies in terms of peak power ratings is deceptive when their true utility lies in the energy they can deliver each day. It takes roughly 6 gigawatts of solar plant (plus batteries) to functionally replace a 1 gigawatt nuclear plant. Talking power rather than energy misrepresents the issues.

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Barbara McKay's avatar

Though Mr. McKibben has long been one of my few heroes, I'm deeply dismayed and disappointed by his embrace of nuclear power. It is by no means eco-friendly! Despite its lack of carbon emissions during operation, there's plenty of carbon emitted during the mining, shipping and processing of the raw materials required. Far worse is the fact that, despite decades of research, there is still NO way to guarantee safe isolation of the toxic wastes from the biosphere for the 10s of thousands of years it takes to break down - and there probably never will be a solution if we haven't found one yet. It's beyond our human capacity to control. Anyway, no civilization has ever lasted nearly that long, so there's no counting on the existence of an advanced technological society extending into the far future. On the contrary: with the natural world already rebelling against us, such a future society is ever less likely to exist. I can't believe Mr. McKibben assumes the attitude of "apres moi, le deluge" towards the long-term dangers of inadequate waste storage. Having seen him speak in public a number of times, I believe he is too good a person to harbor any such notion. But he knows full well that nuclear is insanely dangerous, not to mention more expensive than every other means of generating electricity. As energy expert Amory Lovins wrote decades ago: "Using nuclear power to boil water is like using a chain saw to cut butter." It. Makes. No. Sense. I can't account for Mr. McKibben's blind spot except to assume he's so fixated on carbon emissions, he's willfully blinded himself to other ecological dangers. He had much better stick with emphasizing the far more more benign power sources: solar, wind, geothermal and hydro - not to mention greater efficiency and conservation measures. We do not need to power the lavishly indulgent consumerist lifestyle of the West - the maintenance of which is, I assume, the real argument for nuclear. It's a Faustian bargain that's even now backfiring in the form of climate collapse, and ongoing collapse will only get worse the longer we insist on such delusional ways.

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