With their remarkable electoral successes, Green parties worldwide seized the political imagination of friends and foes alike. Mainstream politicians busily disparage them and imitate them in turn. This new book shows that 'greens' deserve to be taken more seriously than that. This is the first full-length philosophical discussion of the green political programme. Goodin shows that green public policy proposals are unified by a single, coherent moral vision - a 'green theory of value' - that is largely independent of the `green theory of agency' dictating green political mechanisms, strategies and tactics on the one hand, and personal lifestyle recommendations on the other. The upshot is that we demand that politicians implement green public policies, and implement them completely, without committing ourselves to the other often more eccentric aspects of green doctrine that threaten to alienate so many potential supporters.