The United States military budget -- for the single year of 2019 -- was $693 billion.https://twitter.com/tictoc/status/1187219939251445761 …
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I've looked at a quite a few cost estimates for different approaches. $300 billion is far lower than any of the others, which tend to be in the hundreds of billions for each year. A problem with most of the proposals is that the models tend not to be very believable.
This, incidentally, seems like quite a serious and detailed proposal (my current reading):https://www.cell.com/joule/fulltext/S2542-4351(18)30225-3 …
