We need to replace the fossil fuel power plants, the primary source of greenhouse gas. Now.
At a scale required to accomplish this task: ethanol starves people, not a viable option. Fracking releases methane, not a viable option. Cellulose bio fuel uses food land, not a viable option. Solar uses food land, not a viable option. Wind is intermittent, not a viable option.
All human and agricultural organic waste can be converted to hydrogen, through exposure to intense radiation.
The radioactive materials exist now, and the organic waste is renewable daily.
Ending the practice of dumping sewage into our water sources. Air, water, food and energy issues receive significant positive impacts. Reducing illness and health care costs as well.