Nobody knows for sure, of course, but my understanding is that it is thought to be between 2.0 and 2.6 in the “do nothing” scenario. Which is scary big: See the

Nobody knows for sure, of course, but my understanding is that it is thought to be between 2.0 and 2.6 in the “do nothing” scenario. Which is scary big: See the Ferguson paper that I referenced in a different comment.