Tamil Nadu state in south India suffers from seasonal extremes in water availability. Sometimes there is too much water, and in other seasons not enough. Chennai, the coastal capital of 10 million people, experienced a “Day Zero” crisis this summer, ...

High up in the stratosphere, naturally occurring ozone reflects solar radiation back into space, protecting people and the planet from harmful ultraviolet rays. But closer to Earth’s surface, rising ozone levels – formed when pollutants from a wide range of sources react ...

Walking is the oldest, most democratic way to get around. But as urban areas have become more sprawled, walking has slowly been suffocated by other modes of transport that are less healthy for both people and cities. Wide, congested roads ...

The Intergovernmental Panel on Climate Change’s latest report on the prospects for staying under 1.5 degrees of warming is a call to action and a warning. The world is not on track to limit dangerous temperature rise and its follow-on ...

In the 1990s, New York City needed a new water filtration system to serve its nearly 8 million people. But the prospect of spending $6-10 billion on a new water treatment plant, and another $100 million on annual operating costs, ...

This series, supported by the Volvo Research and Educational Foundations, discusses walking and cycling in cities with a special focus on low- and middle-income countries. Many cities have streets that make life difficult for pedestrians in ways that are not always ...