l watched the A Perfect Planet documentary by David Attenborough and l found it acutely depressing.

It made me think to myself how dare we be so arrogant as to think we are above all other species? How dare we nearly wipe them all out to continue our sordid way of life, with wars and polluting the planet - running it as a business instead of a living organism And how dare we go ripping it off, leaving nothing for future generations People say to me do l want to live a long life? Do l hell. l don’t want to see the world lose its species and end up with more wars. Generally l am an optimist, l hate to be a pessimist. l love wildlife, nature and children. But we should think about the sort of world our children are coming into.

Robert D Greaves, Alder Way, New Earswick, York