The recession happened for any number of reasons and I'm an environmental reporter, damn it, not a business reporter but its undeniable that the U.S. went on a spending spree. That had negative impacts on our national wallet, but it also has a negative environmental effect all that stuff builds up. That's why the trend towards "collaborative consumption" technology-enabled sharing and renting of goods is one of the most heartening environmental trends. Startups like Swap.com allow users to arrange trades of books, movies and CDs, letting us share media rather than buy it. And new sites like SnapGoods can help you rent stuff iPads, robot vacuums, camping equipment from others in a peer-to-peer fashion. You can even rent out your car or rent another person's car by the hour with RelayRides. It's green, but it also appeals to the desire for community we all feel. That's win-win.