I'll agree and I'll disagree. I hope I won't sound facetious here, but hear me out for a second.
I have a really smart 13-year-old, and he just did a science project for the science fair. It was a well-designed project and he did a lot of statistics on it. At the end, I said, “Michael, what did you learn from your science project?” He said, “Dad, I learned that you can never really prove anything and you can never really disprove anything in science. All you can do is get the statistical probability that you almost proved or disproved something.” I said, “Michael, in grade seven, you are light years ahead of most of the master's degrees and some of the Ph.D.s on the planet.”
To get slightly technical here for a minute, we have one experiment, no controls, one planet, no degrees of freedom, and we are never going to know with certainty what's going to happen in the future, based on the science. At some point, all of us—both sides of the table, all sides of the table—are going to have to decide for ourselves that value judgment as to how much risk we want to accept and what kind of planning we want to do.