"Eco Friendly Car Rental Site ... Announces U.S. Launch": Vroom Vroom Vroom, an Australian-founded car-rental outfit, has crossed the ocean to offer US drivers "a fast, hassle-free and environmentally friendly" ride while on the road. In addition to promising quicker, cheaper rentals, the company also offers free "carbon offset" credits with each rental. I haven't had a chance to vet just how free these offsets are, or whether they truly negate all the carbon dioxide your trip would generate. There's nothing on the company's home page, though, about how green their rentals are, so maybe they're not that proud of that after all.