Just 25 big cities accounted for more than half of the climate-warming gases pumped out by a sample of 167 urban hubs around the world, an analysis of emissions trends showed
In per capita terms, however, emissions from cities in the richest parts of the world are still generally higher than those from urban centres in developing countries, researchers found inThe study compared greenhouse gas emissions reported by 167 cities in 53 countries, and found that 23 Chinese cities - among them Shanghai, Beijing and Handan - along with Moscow and Tokyo accounted for 52% of the total.
Chen and other scientists cautioned, however, that some of the data available for use in their study was patchy, with some cities reporting numbers from as far back as 2005.'LAST BIG PUSH' "It's really difficult to compare apples to apples on city greenhouse gas emissions but you have to try, and the paper makes a pretty good effort," added Dan Hoornweg, a professor at Ontario Tech University and former adviser to the World Bank on sustainable cities and climate change.
But only 30 of the 42 cities where progress was tracked in the study had shown a reduction. Most of them were in the United States and Europe.
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