... http://www.denverpost.com/breakingnews/ci_22593942/big-fracking-fluid-spill-near-windsor-is-cleaned?source=pkg ...
... http://www.denverpost.com/environment/ci_22586154/water-fouled-fracking-chemicals-spews-near-windsor?source=pkg ...
... http://www.huffingtonpost.com/2013/02/14/frac-chemicals-spill-near_n_2689822.html ...
... http://www.sfgate.com/business/energy/article/Report-Flaws-in-EPA-drilling-pollution-data-4298903.php#ixzz2LdoeHzWD ...
... ...
... http://www.worldenergyoutlook.org/goldenrules/#d.en.27023 ...
... http://www.newtechmagazine.com/news/experts-begin-work-designing-albertas-environmental-monitoring-system/1000993731/ ...
... http://www.oilandgaseurasia.com/news/p/0/news/14981 ...
... http://fracfocus.org/ ...
... http://www.usatoday.com/money/story/2012-03-09/fracking-gas-drilling-earthquakes/53435232/1 ...