Follow these links to relevant articles and bibliographies
http://www.saigon.com/~anson/ebud/ebdha006.htm
Earth Sangha at http://www.earthsangha.org/buddhism/index.htm
View from the Government of Tibet in Exile at http://www.tibet.com/Eco/eco8.html
Relation between Religion and Environment at
http://daphne.palomar.edu/calenvironment/religion.htm
Buddhism and Earth concerns at
http://daphne.palomar.edu/calenvironment/religion.htm#Buddhism
Buddhism and Ecological concerns bibliography at http://environment.harvard.edu/religion/religion/buddhism/bibliography.html