According to the folks at carbonfootprint.com, as U2 walk on their 100 date, 18 month world tour, their carbon footprint will equal the yearly output of 6,500 people.
You should read the whole thing at YesButNoButYes because the incorporation of U2 titles into the blog post was pretty impressive.
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how does U2 square their tour being sponsored by RIM while their private equity group funds Palm?