Metallica fue invitada a tocar en julio de 2007 en el festival "Live Earth" en favor del medio ambiente y la preservación de la naturaleza del planeta. Tocaron Sad but true, Nothing else matters y Enter Sandman
On July 7, 2007, more than 100 musical acts performed at a series of worldwide concerts collectively called Live Earth, kicking off a multi-year campaign to combat climate change and advocate environmentally sustainable living.
