My very rough gut estimate says something like $1B. Probably more on the margin, just because we seem to have plenty of money and are more constrained on other problems. I think we are currently funding projects that are definitely more cost-effective than that, but I see very little hope in scaling them up drastically while preserving their cost-effectiveness, and so spending $1B on 0.01% seems pretty reasonable to me.
My very rough gut estimate says something like $1B. Probably more on the margin, just because we seem to have plenty of money and are more constrained on other problems. I think we are currently funding projects that are definitely more cost-effective than that, but I see very little hope in scaling them up drastically while preserving their cost-effectiveness, and so spending $1B on 0.01% seems pretty reasonable to me.