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Can Exxon freeze the CO2 out of gas?

Exxon announced this week that it's developed an experimental process to affordably remove CO2 and hydrogen sulfide from natural gas. The plans include a $100M test facility, to be built this summer in LaBarge, Wyoming, where the petroleum giant will test out it's "Controlled Freeze Zone" technology -- attempting to freeze and remove many of the greenhouse components from natural gas.

If the freezing process turns out to be a winner, Exxon will be able to produce cleaner burning fuel while also making it cheaper to process "sour gas" -- that's gas containing high levels of hydrogen sulfide. The leftover CO2 could be used in oilfield recovery projects, or stored underground -- a pretty controversial idea in itself. Do you think it's crazy to keep working on ways to make fossil fuels cleaner, like freezing gas or clean coal? Or, should these oil companies be spending their money on a more sustainable technology?

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