The accords are voluntary but include firm targets-like increasing renewable energy use to 10 percent within seven years, and reducing per capita water consumption by 10 percent by 2015. Generation Earth, a nonprofit group that worked with ICLEI and U.N. officials to organize the summit, will regularly grade each city's effort to meet the accords. There is tremendous power in targets and timetables, ... Even if the same person isn't there, if you set a goal of 10 percent renewable power within seven years, you can check and see if they've achieved it.