Is it a good idea to spend trillions of dollars, now, on emissions controls? Money spent now is money not available 10 years later for spending on more advanced versions of the same thing.

This thing is way serious, but war is serious too and that doesn’t mean every imaginable weapon should be bought in any imaginable quantity. Means must be portioned out, in both cases.

Part of the answer to our AGW problem has to be R&D. Instead of buying enough solar cells to pave one square mile of AZ right now, we might do better to work away at the technology, in hopes of being able to pave two square miles for the same cost, down the road. or four, or twenty.

Whatever we ultimately do will require scaling to heroic dimensions, and we simply cannot scale up a solution if it’s too expensive. If it requires more inputs than are physically available, it won’t be done.

It’s disappointing that he doesn’t answer that he does know and that we are the cause. But “not knowing” leaves the door open.