If you’ve turned on your TV, logged onto the Internet, or picked up a newspaper in the past week, chances are you’re at least generally aware of what’s currently happening with Volkswagen. But if you’ve been living under a rock, here’s a summary: Volkswagen made an amazingly efficient, clean diesel engine…that ended up not being so clean. By using a defeat device, VW’s 2.0-liter diesel engine was able to pass the EPA’s emissions tests while actually polluting at a rate of up to 40 times the tested numbers. The audacity of the transgression is shocking enough, but now that the investigation has begun to expand beyond VW’s 2.0-liter TDI 4-cylinder, the entire future of diesel-powered cars may be in question.