Dr. Peter Gleick is a water expert at the Pacific Institute who is very vocal about the state of fresh water supplies in the US. Recently he wrote about the debate in California on if some threatened species need to be allowed to go extinct to allow for better human and ecosystem health in riparian and coastal habitats. Basically, whether or not some species need to take one for the team as we deal with a water crisis. NYT columnist Andrew Revkin has a really interesting response to Dr. Gleick's argument in an article titled The Limits of Laws as a Conservation Tool. The two pieces together make for some fascinating reading on conservation and law, and they're both well worth a read.