I'll see if I can add an example or two.

If I give the talk to other audiences later, when I am not constrained to 20 minutes, I can add some more.

I've discovered when you say, "There may not be medications", I get a lot of arguments that this is the highest use, so of course we would have medications, even if we had nothing else. Also, if I say there may not be plastics, someone believes that since they take such a small share of the petroleum, surely they will be spared. And so on.

If this is a part of a group of talks, it is hard to know how much foundation the other speakers will have laid.

Gail, what a great way of expressing the problems of medications or any usage - somehow they end up broken down and we're still using as much oil as ever! That's very helpful to me when I run into these same questions.

Sharon