increases our demand for green electricity.)
Second, to supplement solar-thermal heating, we electrify most heating
of air and water in buildings using heat pumps, which are four times more
efficient than ordinary electrical heaters. This electrification of heating
further increases the amount of green electricity required.
Third, we get all the green electricity from a mix of four sources: from
our own renewables; perhaps from “clean coal;” perhaps from nuclear;
and finally, and with great politeness, from other countries’ renewables.
Among other countries’ renewables, solar power in deserts is the most
plentiful option. As long as we can build peaceful international collabor-
ations, solar power in other people’s deserts certainly has the technical
potential to provide us, them, and everyone with 125 kWh per day per
Questions? Read on.