Dell Computer’s worldwide business operations are now carbon neutral, the company announced Wednesday. True carbon neutrality is, of course, a chimera for a giant IT company; notes business analyst Clive Longbottom, “You have to question whether they have taken all their workers’ commuting into consideration and the materials in making a computer, going all the way back to zinc mining.” Perhaps not, but Dell now sources one-fifth of its power from renewable sources, buys renewable-energy credits for the rest, and is paying for forest preservation in Madagascar in order to offset 475,000 tons of emissions. Dell, which aims to be “the greenest technology company on the planet,” has also installed energy-efficient lighting, heating, and computing systems in its offices — which provide the handy side benefit of $3 million in savings each year.