This would be an important first step. Keep in mind that one of the main energy inputs to nuclear power is the mining and refining of the ore to get the fuel rods. Or until humanity expands in space to draw on the resources of the entire solar system. I will present a scenario that starts with Clark's and proceeds to an even more unlikely one. When conclusive evidence of the harm from greenhouse gasses is established, the public has become much better at recognizing studies based on mis used data, and can see through the many attempts by various interests to obscure the facts.
World leaders gather to decide on a strategy to deal with the crisis.
In a move of unprecedented statesmanship, the US President asks ME to take charge of the US program. It is, she explains, based on my diverse background as a college professor in various physical sciences and my teaching of environmental courses, combined with the obvious insight and wisdom that is displayed in my newsgroup posts. My decrees will be rubber stamped by Congress and implemented immediately. The most immediate problem is CO2. Most is from power plants and our transportation system.