Our cities are increasingly under scrutiny over their impact on climate change. But in terms of carbon dioxide - one of the greenhouse gases responsible for global warming - could life away from the UK's big towns be doing more damage?
According to the most recent government statistics, the UK's 63 largest towns and cities - defined here as built-up urban areas with 135,000 or more people - account for almost half of all of the country's carbon dioxide (or CO2) emissions.