June 18, 2012 1:30 PM

Commentary: The Rio+20 Earth Summit: A chance to set our planet in the right direction

We are two aging environmentalists with more than 80 years between us spent advocating for a cleaner planet and healthier economy. Even from our well-worn perch, what will be taking place at the Rio+20 Earth Summit in Brazil this week has the makings of a potential game changer.

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