So miniscule that doesn't matter.
You can substantiate that ? A statistic published for the Marcellus Shale development in Pennsylvania puts the
documented failure rate at about seven percent, but there are complaints that inspection and reporting protocols are letting a large number escape scrutiny. I'm not sure where your figure of 70,000 comes from, but applying the seven percent failure rate to that number would mean 5000 leaking wells. For discussion's sake, there are over half a million producing gas wells in the US alone today, with estimates that about 90% of those having been frakked.
Like I said, it's not so much the extent of production that concerns me as the "damn the torpedoes, full speed ahead" attitude that does.
How many people are killed annually by trees frakking rock for resources?
Sorry, I'm missing the relevance of this line of thought.