Workers install rooftop solar in the Chinese city of Wuhan, which has joined with cities across the globe to fight climate change.

Much of the progress in reducing CO2 emissions is being driven by mayors, governors, premiers, and corporate executives. It’s time to acknowledge that reality and move beyond traditional diplomacy by allowing cities, states, and companies to officially sign on to the Paris Agreement

By Daniel C. Esty and ​Peter Boyd


Awaiting Day Zero: Cape Town Faces an Uncertain Water Future

South Africa’s second-largest city has pushed back the day when its taps are expected to run dry. But with its population growing and the climate warming, Cape Town, like many cities in semi-arid regions, must take decisive measures to meet its future water needs. 

By Adam Welz

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In an interview with Yale Environment 360, Norwegian climate scientist Bjørn H. Samset talks about the results of his team’s recent research showing that aerosols linked to human activities cool the planet far more than previously believed.

By Richard Schiffman


In Defense of Biodiversity: Why Protecting Species from Extinction Matters

A number of biologists have recently made the argument that extinction is part of evolution and that saving species need not be a conservation priority. But this revisionist thinking shows a lack of understanding of evolution and an ignorance of the natural world. 

By Carl Safina

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