I give a lot of testimony at hearings and before the courts. Measuring things is a very complicated subject. I like to look at multiple measures. That may be one measure that we use. The IUCN targets are another measure. Is the trajectory of our species at risk going up or is it going down? I think we need to look at all the measures and decide which ones shape public policy.
I think the IUCN has presented a credible system of measurement that's able to be verified, by and large. We may not be doing enough on the private land stewardship side, so that's another measure that we should roll into the system. You don't replace one with another, though. Multiple measures is the way I would go.