Sheryl Crow has begun a campaign to urge people to use less toilet paper in a bid to aid the environment.

The pop singer has recently toured around a series of US universities, lecturing about environmental issues with activist Laurie David.

But she has now turned her attention to the unnecessary wastage of toilet paper.

Writing on her official website http://www.sherylcrow.com/ she encourages people only to use "one square per restroom visit, except, of course, on those pesky occasions where two or three could be required."