How many times do the dangers of hydraulic fracturing — fracking — have to be proven wrong before liberals stop trying to ban the practice of extracting cheap natural gas?

Apparently the answer is indeterminable.

City council members in Los Angeles have called for a ban on the practice of using pressure to extract natural gas and oil from below the earth’s surface. Opponents of fracking are still claiming that it causes property damage, pollution and increases a potential for earthquakes. Each of these claims have been proven false.

Fracking produces fewer greenhouse gas emissions than traditional coal, and there is no significant water pollution attributed to fracking. In fact, former Environmental Protection Agency Administrator Lisa Jackson claimed that “in no case have we made a definitive determination that [hydraulic fracturing] has caused chemicals to enter groundwater.”

And the new Secretary of the Department of Energy, Ernest Moniz, agrees: “To my knowledge, I still have not seen any evidence of fracking per se contaminating groundwater.”

As for earthquakes, Durham University in the United Kingdom found that “the size and number of felt earthquakes caused by fracking is low compared to other manmade triggers such as mining, geothermal activity or reservoir water storage.”

Get that? Naturally occurring heat in the ground is more likely to cause an earthquake than fracking.

But why let pesky things like facts and science get in the way?