Boris Johnson has been urged to back a plan to turn London into Britain's unlikeliest national park.
The move would see Greater London given the same protected status as rural areas like Dartmoor, Snowdonia and the Lake District.
The Greater London National Park campaign claims London is 'one of the world's most important urban habitats.'
Supporters want London to become the first National Park City to protect the capital's biodiversity.
Members of the London Assembly called on the mayor to back the campaign as a way of improving the capital's defences against severe weather.