In many countries in Africa and Asia, billions still need power. They don't have access to power and Govt. can't keep denying them power and let prices of power go unabated. Nuclear though gives some greenhouse gases, it is better than coal. Even solar panels are produced at enormous cost to environment. As long as we aggressively works towards reducing greenhouse gases using renewable sources or nuclear, we have to keep going. There is no ideal, 100% green house gas free source. Most importantly, if this is our goal, developed nations need to share renewable energy and other energy technologies at a lower cost to developing nations.