I agree GM.  To back up what I stated about the number of dams in Brazil alone:

Brazil ’s 2011-2020 energy-expansion plan calls for building 48 additional large dams, of which 30 would be in the country’s Legal Amazon region. Building 30 dams in 10 years means an average rate of one dam every four months in Brazilian Amazonia through 2020. Of course, the clock doesn’t stop in 2020, and the total number of planned dams in Brazilian Amazonia exceeds 60.

http://www.globalwaterforum.org/2012/03/19/be...-amazonia/