It's the American leadership that has not played the role it should be playing and that leaders in other countries have been playing.
Jeffrey SachsOur challenge, our generation's unique challenge, is learning to live peacefully and sustainably in an extraordinarily crowded world. Our planet is crowded to an unprecendented degree. It is bursting at the seams. It's bursting at the seams in human terms, in economic terms, and in ecological terms
Jeffrey Sachs