I already once mentioned that I was going to write a master’s thesis about economic valuation of ecosystems and the Yasuní rainforest of Ecuador. I submitted the thesis some months ago and wanted to make it available to anyone interested in the subject. It can be downloaded here: http://ubuntuone.com/6lkeCkyV4R9LLW9wx8VQLZ I make it available under under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License, so you are free to use it with the restriction of no changes and no commercial use.
[UPDATE: As UbuntuOne, where I had uploaded my thesis, has gone offline, the thesis is no longer available. In case you are interested in getting it, write a comment.]