If everyone lived as Londoner's do, then it would require at least three planet Earths to support them, according to a new report.
Mudchute Farm - an example of sustainability in the shadow of Canary Wharf
This means that an area of this size is needed to produce all the resources that London consumes.
London Remade chief executive Daniel Silverstone said: "London's consumption clearly outstrips its share of natural resources and this points to major problems and constraints for the futures. So the question is, what are we going to do about it?
"In launching our new report, we have aimed to provide government and businesses with some practical ways in which London can work towards becoming a more sustainable city.
"In the long term, we cannot continue to have a capital city that has an ecological footprint of more that twice the size of Great Britain."
The report calls on vast improvement in four areas. These are to reduce the consumption of short-life goods, especially paper and a new approach to diet by promoting food from local sources. It also seeks to improve the energy efficiency of buildings and encourage public transport, walking and cycling.