United Nations special envoy on climate change Gro Harlem Brundtland said June 21 that the Rio+20 summit agreement on sustainable development risks overlooking environmental tipping points and plenary limits in favor of economic and social factors. Ms. Brundtland chaired the commission that prepared the 1987 Our Common Future Report, which preceded the 1992 Rio Earth Summit and popularized the concept of sustainable development, and was a member of a High Level Panel on Sustainability this year that provided a report to the secretary general to help guide the Rio+20 process.