In June of 2012, heads of state, business leaders, and civil society will converge in Rio de Janeiro for the United Nations Conference on Sustainable Development (also known as the Earth Summit, or Rio + 20). This meeting will mark the twentieth anniversary of the 1992 Earth Summit, which galvanized a generation of environmental activists. This meeting was the birthplace of the UNFCCC, and many partnerships were forged and promises made. Rio + 20 will be an occasion to reflect of the accomplishments and failures of the environmental movement in the past two decades, and to forge ahead with innovative solutions and partnerships for the next twenty years. Young people, especially, have a large stake in the outcome of this meeting. After all, it is us who will have to…