In order for fracking to have a chance of leading a transition to cleaner energy, it [ would need a coherent plan to end use of coal and oil ]( http://www.theguardian.com/environment/blog/2014/aug/01/its-time-energy-policy-hums-to-a-different-tune ) . There is no such plan, because the backers of fracking don't really want to reduce fossil fuel use. They only want to extract more and faster. This is aside from the point that fracked gas releases a lot of methane which makes its greenhouse contributions much higher.
Ссылка: https://stallman.org/archives/2014-may-aug.html#03_August_2014_%28Fracking%29