Record air pollution, mainly from coal burning, has smothered the Chinese capital in thick smog for days. It has forced authorities to close schools and factories and issue an orange alert, the second-highest pollution warning.
As Trump's America takes a back seat over climate action, China is expected to take on a lead role in shaping global policies to tackle carbon emissions and promote renewables. Beijing's climate record, though, is mixed.
Clever entrepreneurs are now bottling and selling clean air to offset smog in big cities, as a souvenir, or to hospitals. Many have been astounded by their own success.
Chinese authorities have ordered local meteorological bureaus to cease issuing smog alerts. The move has increased fears that that the government is trying to suppress information on the country's air pollution.
Climate change has forced many Mongolian herders to abandon their nomadic ways and resettle in the country's capital. This brings environmental challenges for Ulaanbaatar - which one group is combating through mapping.
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