U2, Garth Brooks and Linkin Park are just a few of the stars who have placed autographed guitars on the auction block to aid the SAVE THE EARTH FOUNDATION.

Other stars who have given signed memorabilia to the environmental awareness charity for auction include Dave Matthews, Eric Clapton, Kiss, LENNY KRAVITZ, Melissa Etheridge, Neil Young and Paul McCartney.

Fans wishing to bid on the items can do so on Save the Earth Foundation's website until 23 April (03).