There are times when you wish performing artists would just stick to performing. I like Sheryl Crow. I own Sheryl Crow albums. I know the words to a great many of her songs. But now, everytime I hear Sheryl Crow sing, I am going to have to think about this:

Singer Sheryl Crow has said a ban on using too much toilet paper should be introduced to help the environment.

Crow has suggested using "only one square per restroom visit, except, of course, on those pesky occasions where two to three could be required".

The 45-year-old, who made the comments on her website, has just toured the US on a biodiesel-powered bus to raise awareness about climate change.

She teamed up with environmental activist [and An Inconvenient Truth producer] Laurie David for the shows.

The pair targeted 11 university campuses to persuade students to help combat the world's environmental problems.

"I have spent the better part of this tour trying to come up with easy ways for us all to become a part of the solution to global warming," Crow wrote.

"Although my ideas are in the earliest stages of development, they are, in my mind, worth investigating.

"I propose a limitation be put on how many squares of toilet paper can be used in any one sitting."

Crow has also apparently designed a line of clothing featuring a detachable "dining sleeve" so that environmentalist types can wipe their mouths with something besides paper napkins. So far she does not seem to have proposed that the sleeves be used for multiple wiping purposes, thus eliminating the need for TP altogether.