Wealth and prosperity is improving but there are still many great inequalities.
In 2004, 2.8 billion people live on less than £2 per day. Poverty promotes poor health and gender inequality.
Poverty means that millions of people do not have adequate access to food, housing and healthcare.
At the same time, the economies of the developed countries generate wealth and a high standard of living. In 2000, the average income in the UK was £15,700.
The challenge to social sustainability is to see the more equal distribution of wealth.
There are still some people who have lots and some who have very little.