A request: human rights and the environment

After seeing a few talks by John Bonine and Svitlana Kravchenko I'd like to write something, either a post here or something a bit longer somewhere else, on the subject of human rights and the environment. Specifically I want to look at the implications of constitutionalizing a right to a clean and healthy environment. However, I only the most limited sense of the literature on the subject. For obvious reasons I'm most interested in the Canadian case, thought other Commonwealth countries and the U.S. might be interesting too. If you have any good leads please leave them in the comments.