Leading Liberal Democrats and policy experts re-examine their political approach and propose a radical new direction for the party, setting the agenda for the next election and beyond. The Green Book cogently argues that a low-carbon economy and environmental investments are the best way to escape from sluggish growth, create new jobs and share prosperity. It is a clarion call for Liberal Democrats to treat the environmental crisis as a core challenge of economic policy, not a discrete problem. Policies that protect and enhance the natural world - on which our economy and society ultimately depend for our health, well-being and prosperity - should be the driving force behind the party's programme. Furthermore, green policies can provide a vital, clear and popular distinction between Liberal Democrats and Conservatives at the next election. The Green Book offers a challenge to current Liberal Democrat thinking - and stimulating reading to anyone who cares about the environment and the future of the British economy.