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It IS easy being green. These celebrities show us how it's done...

During an environmental tour of US college campuses, Sheryl spent some time dreaming up ways of conserving trees.

Along with designing a "clothing sleeve" - a detachable sleeve to be used during meals as opposed to a napkin - she's also encouraging the limitation of loo roll: "I propose a limitation be put on how many squares of toilet paper can be used in any one sitting," she said.
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