I didn't realize that a dam could cause so much problem.  It is a shame that the people who are going to be impacted the most are the indigenous people.  I don't understand how people feel it is okay to do this to them.  Maybe there are many pros that I just don't know about and this article is focusing only on the negative of the methylmercury.  I guess this goes to show that we as a human race can affect the environment in maybe a not so good way.  What do you think about this?  I am curious what you have to say about this.