 It explores why the present economic system is dependent on economic growth and the effects that the resulting pursuit of growth has had on the environment and society.His other major book, "Short Circuit" (1996) gives dozens of examples of currency, banking, energy and food production systems which communities can use to make themselves less dependent on an increasingly unstable world economy.In "The Ecology of Money", published in 1999, he calls for different currencies for different purposes and for changes in the way money is put into circulation so that a stable, sustainable economy can be achieved.