TreeHugger, the little green environmental blog that could, has been purchased by the Discovery network for $10 million. This is a modest sum compared to the likes of Weblogs, Inc., an entire network of blogs which sold to AOL in 2004 for $25 million and, most recently, MediaBistro, founded by Laurel Touby, which was sold last month to Jupitermedia for $23 million. Still, it's not a bad payout for its founder, Graham Hill (pictured), who started TreeHugger with proceeds from his WeAreHappyToServeYou coffee mug business for which he exclusively licensed the rights to a popular NYC paper coffee cup design. Graham Hill wrote a lengthy blog post yesterday explaining the benefits of the sale to Discovery, noting that Treehugger was courted by "over 15 large companies" over the last year. Principally, Discover is looking to expand its "green" content online, which is where TreeHugger, which is currently ranked as the 17th most popular blog on the web by Technorati, fits in. It makes us nervous to see our favorite indie enviro blog get scooped up by the corporate machine, but it could be worse. Despite selling out, Graham betrayed his media mogul ambitions with his blog post entitled TreeHugger Acquires Discovery Communications.