Trees will be planted in four locations

In this case that means striking a balance between the amount of carbon dioxide produced by the manufacture and distribution of the new Pink Floyd CD, and the amount absorbed by planting forests around the world.

Native trees will be planted in natural woodlands, creating four new long-term indigenous forests.

These will be at Chiapas in Mexico, Tensas River National Wildlife Park in the American state of Louisiana, Bangalore in India - and Dryhope Burn in the Scottish Borders.

And the more CDs that the band sells, the more trees they will plant to soak up the CO2 emissions in the atmosphere.

Pink Floyd's new album Echoes will be released on 5 November.

It features almost two and a half hours of songs from throughout the band's career, mixed into one piece of continuous music by producer and engineer James Guthrie.