Everything we thought would be a solar bottleneck turns out to be a feature, not a bug. Perhaps you've heard that solar is unsustainable because it competes for agricultural land, making starvation the price of clean energy. Wrong: solar provides shade for many crops that have been withering in the soaring heat of a climate-wracked world, and limits evaporation, reducing the amount of water needed to produce food crops. What's more, the cooling effect of that soil-retained moisture helps keep the shade-providing solar panels within their optimal operating temperature, increasing the efficiency of their power generation. And of course, every time someone switches from hydrocarbon fuels to solar, they reduce the demand for ethanol, and a third of America's corn goes into making this stupid, wasteful fuel additive (and corn is America's most prolific crop). That's land that can be given over to growing useful food crops. Solar is increasing our agricultural yields, not competing for farmland.

Then there's the material bill for solar: a recurring (and legitimate, and worthwhile) concern about electrification is that it comes with a vast material bill that will necessitate massive extraction projects. There's good reason to worry that the copper, lithium and conflict minerals needed for planetary solarization will come at the expense of the despoilation of habitat, the poisoning of indigenous people, and the ruination of miners.

Happily, this, too is turning out to be a tractable problem. First off, because the material bill for solarization just isn't that big when compared to the amount of fossil fuels we consume every year. To create the batteries we need to keep the whole world's lights on when the sun goes down and the wind stops blowing, we will need to extract one seventeenth of the amount of minerals we burn every year in the fossil fuel system.