I've always been concerned about global warming. For the past decade or so I've felt guilty about driving. That seems to have been alleviate alot by having bought a prius almost 5 years ago (I bought a used 2004). Prius are undoubtly the greenest, cleanest cars outside of electrics. But I've also always loved driving stick shift cars, and owned a VW Jetta before I bought my prius. Although I was thoroughly impressed with toyota's hybrid technology and the fantastic gas mileage, after 5 years I really miss the fun of driving the understated sportiness of a Volkswagen manual. I just want something fun to drive. My wife has agreed to drive my prius and trade in her honda so i can get a newish volkswagen diesel, which are definitely fun to drive. And although they're a little better on carbon emmission then regular non-hybrid cars, they aren't as clean as the mpg-leading Prius. I've done the research and I'll easily get 44-48 mpg in the model I'm looking at (a 2011-12 VW Golf TDI) but diesel fuel contains more carbon, so in terms of carbon emissions, I'm really emitting about 80% equivalent (~35-38 mpg) of a "gasser" according to the Union of Concerned Scientists. There's also a diesel particulate called "black carbon" that scientists are now believing might be responsible for raising temperatures more quickly than CO2 (although it is destroyed much more quickly: around 50 years as opposed to the hundreds of thousands years it take CO2 to breakdown). I used to feel guilty take long trips in my pre-prius vehicles (eg an hour to my sister's, 1.5 hours to my mom's), I dont want to be feeling guilty after starting a new car payment. So I guess my question is: how do my fellow tree-huggers reconcile the need for something fun to drive with the desire to drive the greenest vehicle possible?