Snow-machining: Using C02 to replace oils

I wonder how quickly industry will embrace this technology? What kind of capital investment will be required to make the changeover? Potentially this could put an entire industry (metail working and cutting fluids) out of business.

I think it is a really cool technology, but isn't CO2 a greenhouse gas, so the government is sure to step in and regulate it to death. It is also a colorless, odorless, dangerous gas at standard atmospheric pressure and temp. and would be difficult to reclaim and re-use to cut costs. I worked with CO2 in the oilfied, and if liquid CO2 was trapped in one of our lines and not vented immediately it could explode due to the pressure build-up as the liquid went to vapor.

I agree that CO2 in quantity is dangerous. The question should be, is it safer for workers and the environment than the fluids currently being used in machining today.
As for reuse, I think it's cheaper to manufacture then to reuse. I would have to see the cost of a one over another in a cost benefit analysis though.