China’s “strictest air protection law” yet took effect on January 1, 2016, promising to bring big changes to its smog-filled cities. But some municipal governments have been ahead of the curve, working to clean up the air through experimentation and innovation. Shenzhen, China’s first special economic zone and which recently passed its neighbor Hong Kong to lead China’s most competitive cities, is one of these.

DURBAN, South Africa — Arguably the most elegant aspect of an inelegant subject is how this city of 3.2 million residents, South Africa’s second largest, is solving monumental water and waste challenges in its jammed informal settlements.

In December 2015, Beijing issued its first-ever “red alert” for smog, its highest air pollution warning, which closed schools and restricted the number of cars on the road. Less than two weeks later, it issued its second.

As a young and promising marine biologist, Camilo Mora led a team of 55 scientists assessing the rapid decline of fish on the world’s coral reefs. It was a global enterprise with broad implications. Hundreds of millions of people rely on reef fish for their primary source of animal protein. Healthy reefs protect coastal communities from devastating storms and provide a multitude of livelihoods, including jobs in the fast-growing tourism industry.

As the United States, Russia, and others step up attacks on the self-proclaimed Islamic State in Iraq and Syria (ISIS), there is concern over their direct and long-term environmental and public health impacts. Many air strikes have targeted lucrative oil installations under the control of ISIS, and these could have severe detrimental effects for Syria’s future, both environmentally and socio-economically. Questions around the effectiveness of these strikes, both from a military and political perspective, seem to be missing in the wider debate.

The recent news that China has been underreporting its already globe-leading coal consumption by nearly 20 percent for the last decade underscores the scale of its air pollution crisis.