Currently, dirty energy sources don't have to account for the full cost of the pollution they release into the atmosphere, and that gives them an unfair advantage. (discovermagazine.com)
The real disagreement is over the best way to cut the cost differential between dirty energy sources, like coal combustion, and those that provide power without pollution. (dotearth.blogs.nytimes.com)
Direct public investment in innovation is a faster means to this end than gradually making dirty energy sources expensive so that clean energy sources gradually become cost - competitive. (dotearth.blogs.nytimes.com)