Associated Press: Computers are far from being truly clean machines, but Dell Inc. and other PC makers are trying to make their own business operations greener. Dell said Wednesday its facilities worldwide are now carbon neutral, a goal the Round Rock, Texas-based company had set to achieve by the end of 2008. Dane Parker, its director for environment, health and safety, said Dell buys renewable energy – including wind, solar and methane gas – directly from utilities to fulfill one-fifth of its …