London must become car-free if it is to substantially cut carbon dioxide emissions, according to a new report.
London is likely to fail CO2 targets, the report says
Researchers claim the Greater London Authority's (GLA) target to reduce CO2 emissions by 60% by 2025 is unlikely to succeed without drastic measures.
The report says emissions could be cut by 72% by 2030 if cars were banned from the city.
The study was compiled the London School of Hygiene and Tropical Medicine and Oxford University.
In response to the findings London Green Party member Jenny Jones said: "I have asked the London mayor to do a feasibility study into creating a car free pedestrian zone in central London linking all the main squares and parks.
"We need to show that the car no longer rules in London and that the future is based upon public transport, cycling and walking."
But Baroness Jo Valentine of London First, which represents businesses in the city, said the answer was realistic road charging schemes.
She said: "Rather than banning cars, we should charge a realistic amount for the use of this finite resource (inner London road space) with the proceeds invested in improvements to the capital's public transport and environment.
"This is precisely what future road pricing schemes for London could be made to achieve."
The findings of the report revealed that London is on course to reduce land transport emissions by only 10-23%.
It said "radical steps", such as banning cars in inner and outer London, were needed to substantially reduce CO2 levels.
The report was first published in The Lancet medical journal.