World leaders and some 40,000 people converged on Rio de Janeiro, Brazil, in June in the hope of charting a path towards a better, more sustainable future for everyone that many are calling the “green economy.” Underlining the urgency, Sha Zukang, secretary-general of the UN Conference on Sustainable Development, said more than a year before the summit began: “If we continue on our current path, we will bequeath material and environ­mental poverty, not prosperity, to our children and grandchildren.”