Every morning our newspapers could read, 'More than 20,000 people perished yesterday of extreme poverty.' How? The poor die in hospital wards that lack drugs, in villages that lack antimalarial bed nets, in houses that lack safe drinking water. They die namelessly, without public comment. Sadly, sad stories rarely get written.

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.

This is our greatest challenge: learning to live in a crowded and interconnected world that is creating unprecedented pressures on human society and on the physical environment.

Tax the rich. End the wars. Break the power of lobbies in Washington. These are the demands of Occupy Wall Street. They are very important. The US corporations dominate Washington. The big oil companies, Wall Street banks and the military-industrial complex - they rule this country and their influence and power has to be broken.

In the early 1990s, when a lot of the developing world opened up to international capital flows... they ended up in very good long-term projects, but projects that weren't going to pay off for five or 10 or 20 years.

Without restoring an ethos of social responsibility, there can be no meaningful and sustained economic recovery.

At the most basic level, the key to ending extreme poverty is to enable the poorest of the poor to get their foot on the ladder of development.