Study Concludes: Fracking -- Small Risk of Causing An Earthquake

Link to Oil & Gas Journal: 

Hydraulic fracturing has a low risk for inducing earthquakes that can be felt by people but underground injection of wastewater produced by fracing and other energy technologies has a higher risk of causing earthquakes ....

Others may see some irony in this part of the report:

Carbon capture and storage may have the potential for inducing seismic events because significant volumes of fluids are injected underground over long periods of time ...

So, here's the irony: "greens" are against fracking and there seems to be minimal evidence that fracking is related to earthquake activity; "greens" are for carbon capture and there is some suggestion that carbon capture may be related to earthquakes. Personally, I'm not worried about either. There is some evidence that nano/micro-earthquakes might be beneficial in preventing major earthquakes.