The longer you wait, the less fun. If you wait until the bitter end, the whole economy can be destroyed.

My concern is not that there are too many sweatshops, but that there are too few.

Deep down, if we really accept that their lives - African lives - are equal to ours, we would all be doing more to put the fire out. Its an uncomfortable truth.

It's not an accident that the U.S. ranks lowest of all major donor countries in the world - that is the share of our income that goes to development aid. Americans will ask whether, because were so generous privately, that makes up the difference. But it doesn't. We still rank far below other countries.

It's not so unusual to run out of someone else's currency.

In my view, there is an urgent need to communicate with the public and help to explain where there is consensus, and where are there doubts about the issues of sustainable development.

My colleagues and I took a stand in our work several years ago that we would not look for the magic bullet, because there is none. These are just basic problems requiring basic work. Nothing magic about it.