 Martin had earlier said that the band would not tour to promote the album until they could work out "how our tour can not only be sustainable (but) how can it be actively beneficial", and hope that it would be entirely carbon-neutral.Coldplay launched the album by performing a one-off show for the charity ClientEarth at London's Natural History Museum.The band played beneath Hope, a giant 128-year-old skeleton of a blue whale in the museum's great hall.