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Buzz about the global-warming-focused concert series expected to “dwarf” Live Aid is continuing to, well, buzz. Speculation about who will perform has begun — with U2, Coldplay, Madonna, and Kylie Minogue topping the list. (There are even rumors of a Spice Girls reunion.)

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Though most sources are calling the series “Live Earth,” one whisper site reports that the concerts will go by the name Save Our Selves (SOS) and be hosted by MSN.

Save Our Selves (SOS) aims to connect people around the world with seven concerts on seven continents on 7/7/07, to create a global community with a single environmental vision and purpose.

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A homepage for the global event may already be set up at http://saveourselves.com. Currently, the site allows you to sign up for news alerts. I’ll be sure to update you if I’m alerted of any news. An official announcement is expected to come later this week.