I wrote about this in Free Market Environmentalists are building America's largest wildlife reserve [with video embeds], and there are more videos there, too.

Since then, however, I've learned that the project also has opposition. I don't know the full arguments of the opponents, but it seems that they're concerned about wealthy philanthropists driving up the price of land in the region and driving out the local farmers. I think they are also concerned about the reintroduction of dangerous species like wolves and grizzly bears that kill the livestock on ranches in the area.

Based on my limited knowledge, I still like the idea, but apparently there is also a potential downside for the local communities. As they say, there's no such thing as a free lunch.