Emissions have peaked in 27 of the C40 group of major cities, including London, New York, and Paris

So mayors announce at the Global Climate Action Summit in San Francisco. Emissions continue to fall. 66 cities expect to peak by 2020.

Wired: “That’s a big deal in the fight against climate change.” More than half the world’s population lives in cities – a proportion expected to grow.

Method: C40 compares a given city’s numbers year over year. To count as a peak, that high point in emissions must be at least 5 years ago, which avoids a false peak.

C40: “A further 22 C40 cities in the Global South have made a commitment to deliver action consistent with the ambitions of the Paris Agreement and reduce their emissions to net zero by 2050. Thus the total number of C40 cities that have either already peaked, are expected to peak in the next few years or have committed to peaking is 88 cities, representing 85% of C40 city emissions.”

Image: screenshot from C40 website

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