Based on the four mega-trends of monetary instability, global greying (an ageing global population), the information revolution, and climate change and species extinction, Bernard Lietaer looks at different scenarios of what the world might be like in 2020. 1. The Corporate Millennium: governments are disbanded, central banks close down and the world is run with Big Brother control by huge corporations with their own currencies.2.Caring Communities: people retreat into small, self-sustaining communities, like tribes.3.Hell on Earth: in which the breakdown of life as we know it is followed by a highly individualistic free-for-all, resulting in an ever more obscene gulf between rich and poor.4.Sustainable Abundance: envisages a world where we take better care of the environment, re-engage the poor and the unemployed in mainstream society and give back time and fulfilment to the over-worked, while providing the elderly with a high level of personal care.A society of sustainable abundance is achievable - but only if we are willing to re-invent our money system and create new currencies.