On average, the 30 cities identified by C40 have curbed emissions by 22%. Some of the most significant reductions came from London, Berlin, and Madrid, with 30% reductions, while Copenhagen lowered emissions by a dramatic 61%. Granted, when Copenhagen hit its highest emission levels to date in 1991, it was only releasing 4m tons of emissions, compared to, say, the 50m tons from London in 2000.

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