Copenhagen Wants to Show How Cities Can Fight Climate Change


The beginning of a ski run on the roof of Copenhagen’s new trash incinerator, which will help heat buildings in the city. Photograph by Charlotte de la Fuente

COPENHAGEN — Can a city cancel out its greenhouse gas emissions?

Copenhagen intends to, and fast. By 2025, this once-grimy industrial city aims to be net carbon neutral, meaning it plans to generate more renewable energy than the dirty energy it consumes.

Here’s why it matters to the rest of the world: Half of humanity now lives in cities, and the vast share of planet-warming gases come from cities. The big fixes for climate change need to come from cities too. They are both a problem and a potential source of solutions.

The experience of Copenhagen, home to 624,000 people, can show what’s possible, and what’s tough, for other urban governments on a warming planet.

The mayor, Frank Jensen, said cities “can change the way we behave, the way we are living, and go more green.” His city has some advantages. It is small, it is rich and its people care a lot about climate change.

Mr. Jensen said mayors, more than national politicians, felt the pressure to take action. “We are directly responsible for our cities and our citizens, and they expect us to act,” he said.

In the case of Copenhagen, that means changing how people get around, how they heat their homes, and what they do with their trash. The city has already cut its emissions by 42 percent from 2005 levels, mainly by moving away from fossil fuels to generate heat and electricity. MORE

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