Beacuse BigOil is making money hand over fist from gas, and Big Coal is not a threat. So instead of daily dose of ozone action days across the nation and thousands of lung patient dying, we hear about milisieverts at Fukushima - where we have to have a first victim of radiation.
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Now should BigCoal try dream up silly like coal-based synthetic fuel with nuclear-heated steam, they'll be slapped back to the Carboniferous Epoch.