Singer Sheryl Crow arrives at the 2007 Elton John AIDS Foundation Oscar Party at the Pacific Design Center in West Hollywood, California, February 25. - Reuters

Sheryl Crow's rider demands for her 'Stop Global Warming College Tour' reportedly included four buses, six cars and three tractor trailers for her entourage.

The singer, who travelled on a bio-diesel bus for two weeks during the tour, is said to have made the environmentally unfriendly request to ensure her staff travelled in comfort.

Sheryl's pollution-heavy request comes in the wake of her urging young people to reduce their carbon footprint.

She said: "As we've been telling them, it's not about doing everything, it's about doing something. We want to bring people over to the side of protecting the environment and give kids some idea of how they can be a part of that movement."

Sheryl also reportedly requires a variety of alcoholic beverages, depending on what day of the week her shows fall.

Daily alcoholic

If she performs on a Tuesday, Sheryl requires gin, on Thursdays she wants champagne, while on Fridays she demands tequila.

The 45-year-old also asks for 12 bottles of Grolsch beer, six bottles of 'local' beer, along with "good Australian Cabernet" and "good Merlot" wine.

A representative for the singer said: "That rider was an old one. It was from 10 years ago."

The representative declined to show a current rider for Sheryl.

- Bangshowbiz