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At best, the direct combustion of oil shales produces carbon emissions similar to those from the lowest form of coal, lignite, at 2.15 moles CO2/MJ,[2] an energy source which is also politically contentious due to its high emission levels.[17][18] For both power generation and oil extraction, the CO2 emissions can be reduced by better utilization of waste heat from the product streams.
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Currently, the in-situ process is the most attractive proposition due to the reduction in standard surface environmental problems. However, in-situ processes do involve possible significant environmental costs to aquifers, especially since in-situ methods may require ice-capping or some other form of barrier to restrict the flow of the newly gained oil into the groundwater aquifers. However, after the removal of the freeze wall these methods can still cause groundwater contamination as the hydraulic conductivity of the remaining shale increases allowing groundwater to flow through and leach salts from the newly toxic aquifer
Asbestos for insulation was a great idea too! Until all the cancer victims showed up.Make money before the science is known, or the regulator shows up, then repeal health care and drop all the cancer victims, now that's a great business model from the guys who defend low taxes for the rich, but not the middle class. Or what's left of it, but why let a good hostage go to waste?