If you;re worried about pollution, then become a vegetarian. The various emissions from cows feeding and related transport is the largest single cause of CO2 emissions, not to mention the fact they produce a full third of the world's methane, which is literally 20x more damaging than CO2. Unless you're willing to do that, you shouldn't bother worrying about your oil consumption.
Global warming/pollution is a serious concern, but most of what they tell you about it is related to someone wanting to make money with their new 'green' invention. You could drive 200 miles every day in a diesel engine while guzzling bottled water and leaving all your lights on,and you're not doing as much damage as one cow. All these people selling you eco-crap and carbon credits (Did you know Al Gore owns the company he buys his from, there's no real industry oversight and almost none of them are non-profit?) are scam artists who deluded themselves into thinking they're the good guys.