One third (33 1/3%) of oil reserves, one half (50%) of gas reserves and more than four fifths (80%) of coal reserves need to remain unused between now and 2050 to avoid catastrophic climate disruption. There is no need for Keystone, the other pipelines, mountain-top coal removal, hydraulic fracturing and so on and so forth. Air, water and the environment would benefit as well. There is a need to transition to renewable energy by making oil, coal and gas secondary rather than primary sources of power.
http://www.nature.com/nature/journal/v517/n7533/full/nature14016.html
http://www.takepart.com/article/2015/01/08/we-might-avert-climate-catastrophe-one-radical-choice?cmpid=san