Obama wants 80 percent of America's energy to come from clean and renewable sources by 2035. But what would that really take? Mostly, it means replacing 2/3 of our coal-fired power plants with power sources that don't depend on fossil fuels. The scale of that ambition is difficult to comprehend — which is why it's handy that Climate Central has created an interactive to walk you through what it really means. The image above is just a screengrab — run, don't walk, to the original.)