"We can't just replace Edge because you're good at Guitar Hero, " he explains.

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Of course, not everyone is going to do like Terry and replace their disposable razors with a vintage straight-edge razor, but her book is full of easy tips that even the laziest environmentalist could implement, and she goes far beyond the usual bag and bottle tips, too.

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The Edge co-founded Music Rising, a charity to replace instruments lost or destroyed in Hurricane Katrina.

BBC: NEWS | Entertainment | U2 guitar sale helps raise $2.4m