Because these are societal benefits, we need to find a way to engage society in paying for these benefits. That would take both the ability to measure, and that's a complex scientific challenge but one that's not insurmountable, combined with a framework of policy, markets, and a system that would engage society. For now, society hasn't been engaged in paying for these benefits. That would be an important step that I would see.
On May 17th, 2012. See this statement in context.