Okay, I'm going to move on here. I didn't really want to talk about smoking, but the point is taken. There are lots of analogies.
Basically every one of you has said categorically that a 50-year benchmark or a long-term goal of achieving something might be the right way to go. Along the way, there are going to have to be some milestones. You don't get to the end without achieving milestones and having a step-by-step plan.
From a philosophical or theoretical perspective, going back into each of your personal areas of expertise, my question is, what would be a realistic greenhouse gas emissions target? What would be reasonably achievable by 2020?