Forget PC vs. Mac. The real question to ask yourself is desktop computer vs. laptop. According to The Daily Green, laptops are hands down the winners in this one, as they use a fraction of the energy of a desk top computer (15-25 watts per session vs. 125).
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Awesome! I can use this in the grand argument with my husband of whether to get a desktop or stick to our lappies! hooray!
And they are so much easier to carry on business trips, too!