What have you seen that shows the ozone hole is closing?
What’s happening now is we’re actually able to show some evidence for it getting better finally, due to the changes made globally under the Montreal Protocol to stop making these molecules. So to me, it’s pretty amazing that we can see that.
How much of the healing does the Montreal Protocol account for?
I think it’s about half. The Science paper shows that you can pretty consistently explain about half the decrease in the depth of the ozone hole. And when it comes to the area, it’s even a little more than half.
Are we out of the woods yet?
No, it’s not completely healed; it’s a long way to being back to where it was. It’s not going to heal completely until the middle of the century, but it’s pretty clear that it’s on the road to healing.