The city, which is in the middle of its second-ever red alert for smog, is not alone in facing cripplingly high pollution levels. Can China learn from the lessons of London and Mexico City?
Worsening air conditions in China have lead to heightened public frustrations with pollution, causing the government to confront companies believed to be lying about their emissions data.
In the first study of its kind, scientists compared 25-years of data for over half the Earth's lakes and found some disturbing trends that will affect humans around the world.
The records, climate scientists believe, may offer clues to the sorts of changes being witnessed today, and provide a longer arc of Arctic weather patterns.
The former governor of California urges Americans to stop bickering about whether fossil fuels have contributed to climate change. Instead, he says, the US should transition to clean energy because it makes economic sense.
Past efforts have pitted the wildlife experts and fishermen against each other and offered little additional protection for whales. This year, the two camps are trying something different: cooperation.