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Pedro Szekely / Flickr / CC BY-SA 2.0

By Andrea Germanos

Chicago made history on Wednesday by becoming the largest U.S. city to commit to 100 percent renewable energy before the middle of the century.

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Cycling advocates set up "ghost bikes," like this one in Brooklyn, in memory of bikers killed in traffic. Nick Gray / CC BY-SA

By John Rennie Short

As cities strive to improve the quality of life for their residents, many are working to promote walking and biking. Such policies make sense, since they can, in the long run, lead to less traffic, cleaner air and healthier people. But the results aren't all positive, especially in the short to medium term.

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EcoWatch Daily Newsletter

A coyote photographed by the motion-activated camera along the Los Angles River. National Park Service

By Jeff Turrentine

I used to live in a hilly, temperate corner of the American west, right near the banks of a meandering river. On late-evening walks with my two dogs, I would routinely encounter all manner of economy-size mammalian wildlife: skunks, raccoons, opossums, coyotes. Sightings of a mountain lion in the area had occurred more than once, though my dogs and I were perfectly happy never to have chanced upon him. During the day, it wasn't unusual to see red-tailed hawks or turkey vultures circling overhead, or rigid V-formations of migrating Canada geese, or even the occasional egret or blue heron swooping down as it made its descent to its riparian home.

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Pexels

By Trina Hamilton and Winifred Curran

There are many indexes that aim to rank how green cities are. But what does it actually mean for a city to be green or sustainable?

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Mayors for 100% Clean Energy

The Sierra Club released a new analysis Friday that found that transitioning all 1,400+ U.S. Conference of Mayors member-cities to 100 percent clean and renewable electricity will significantly reduce electric sector carbon pollution nationwide and help the U.S. towards meeting the goals of the Paris climate agreement.

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