When the government tries to run innovation, sometimes it does it well and sometimes it doesn't. So setting up a situation where the market runs innovation, which is a cap-and-trade idea, may well have more flexibility.
Carbon tax has the advantage of basically being able to subsidize one set of activities that you want with another set of activities that you don't want. It's like a cigarette tax.
One advantage of a solar collector in space: It would be some kind of origami thing that would unfold and be relatively light because it doesn't have gravity to deal with.
This is pretty much the infrastructural stuff that comes along with large quantities of energy. Whichever technology we are looking at has serious hazardous issues.
The main problem with solar on the Earth's surface is that it is so intermittent, and we don't have decent storage yet.
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