For good introductory chapters go to:

Stewart, N  Ethics: An Introduction to Moral Philosophy (Polity, 2009) Ch.7

Tannsjo, T Understanding Ethics (Edinburgh, 2004) Ch 8

For a PREZI presentation (excellent) on Utilitarian Ethics and the Environment by Thomas O’Neill go to

http://prezi.com/nyvj4qj5pbsc/utilitarianism-and-environmental-ethics/

Foe an overview of Environmental Ethcis by Katie McShane go to

http://iseethics.files.wordpress.com/2013/01/mcshane-katie-environmental-ethics-an-overview.pdf