To paraphrase Leo Tolstoy: Every polluting city pollutes in its own way. Yet until recently, just how and whence Los Angeles, Bangkok, and eight other global cities exhaled their climatec-hanging vapors was a topic shrouded in mystery. Now, a 10- city comparison of greenhouse gas emissions per capita is showing metropolises “exactly where their emissions are coming from,” says Christopher Kennedy, an associate professor of civil engineering at the University of Toronto and the study’s lead...


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