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    The great Italian writer Italo Calvino once wrote “You take delight not in a city's seven or seventy wonders, but in the answer it gives to a question of yours.” Indeed, throughout human history, people have looked to cities for answers – to questions of economics, trade, public health, culture and education. This week, as national leaders begin to consider how they will deliver on the deal agreed at the international climate negotiations in Paris, they should turn to cities once again for answers.

    An op-ed by Eduardo Paes, C40 Chair and Mayor of Rio de Janeiro, Anne Hidalgo, Mayor of Paris, and Eric Garcetti, Mayor of Los Angeles

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    Today, the C40 Cities Climate Leadership Group (C40) and research partner Arup released Climate Action in Megacities (CAM 3.0), a groundbreaking and definitive assessment of how the world’s leading mayors have taken on the urgent challenge of climate change. CAM 3.0 presents major new insights into the current status, latest trends and future potential for climate action at the city level. Since the last major COP in Copenhagen, C40 cities have taken 10,000 climate actions – a doubling of actions in just six years – and have committed to reduce their CO2 emissions by 3 Gt CO2 by 2030, equivalent to the annual carbon output of India.

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