During weekends, bicycles whizz by and families stroll down streets that are often clogged with honking cars. The city's new justice building is rising from an eco-friendly district of northern Paris: a fabrication of stone and glass that will feature a massive rooftop garden.

The French capital itself is transforming as it aims to be the linchpin for an ambitious global plan to tackle climate change.

"The city of Paris is changing - so are other big cities in the world," said Paris Deputy Mayor Patrick Klugman. "We can have snowstorms. We can have floods. We can have things we are not used to. So we are getting prepared to face them

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