Unfortunately this is still an incredibly small percentage of total power supply in the US. Barely 1% if you're being generous. I've got the math at Earth Sentinel, which covers peak oil, renewable energy, and climate change.
There are a number of problems with this, the major one being that natural gas is a fossil feul, and brings us no closer to a sustainable transportation model. You can see more arguments against it at http://earthsentinel.com/
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