"To run trains, cars, and other everyday machines, the U.S. consumed about 2.5 billion gallons of petroleum-based lubricants in 2005. More than a third of that quantity ended up in the environment through various channels—pipe or drum leaks, accidental spills, and people discharging oil into drains."
With the advent of new technology, vegetable based lubricants can now compete with petroleum based lubricants on a pricing level. The playing field is drawing more even... though just a bit at a time.
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