Mega-cities around the world such as New York, London, Los Angeles, Shanghai are often blamed for the high Green House Gas(GHG) emissions but a recent report released found that cities like Sydney(20.6), Calgary(17.7), Stuttgart(16.0), Denver (21.5), Rotterdam (29.8) CO2 equivalent (tCO2e) per capita where far higher than some of the world’s mega-cities including Shanghai (11.7), Tokyo (4.89), Dehli (1.5), Mexico City (4.25), London (9.6) and New York (10.5) CO2 equivalent (tCO2e) per capita. Although it could be seen that the overall city emissions are high however, when measuring tCO2e per capita it gives a very different picture.
The report focused on the Canadian city of Toronto and the results were surprising across the city as an inner city resident could have an annual emissions as low as 1.3 tCO2e whereas someone in a sprawling outer suburb could have 13.02 tCO2e. The report has a series of aerial images including high-rise(1.31) to outer suburbia(13.02) with the annual emissions for the area which gives a great insight into urban design and consequent emissions.
Lowest emissions in the study where from apartment dwelling city residents using public transit as there main source of transport.
I recommend reading the report ‘Cities and greenhouse gas emissions: moving forward‘ (10 January 2011) – a free copy is available from Environment & Urbanization
NOTE: Values in brackets () are tonne CO2 equivalent (tCO2e) per capita