Hackney, like every other authority in the UK, is preparing a climate action plan and like every other authority it devises its plan on the basis of its own territorial boundaries. A major problem for plans like these is, of course, that climate knows no borders and trying to ‘fix’ the problem in one part of London without coordinating action with other authorities will undermine the whole project.

The Lea Valley Park and the Marshes, East London’s Green Lung, is the most…