The original Brazilian story is from August 2016 and it says the meeting was going to take place in September, so it's very likely that the negotiations are finished.
Edit: I search for more recent news and I found that there have been fracking operations in the region, at least in Argentina and Uruguay, in search for oil. There was also a reported oil and chemical spill recently that may have affected the underground reserve.
tranarchy wrote
and yet people still think capitalism is voluntary and consensual