Millions of Americas affected by wildfire smoke are focusing on the colors red, purple and maroon on the Air Quality Index charts. Red used to be the scariest color. Why did that change?
A plume of smoke and soot stretches for thousands of miles from the province of Quebec province across the Atlantic Ocean, as seen in satellite images from NASA.
Like an increasing number of national parks in the United States, Mount Vesuvius has begun rationing access with a quota system. The system has had some problems.
As Japan plans to release treated radioactive water from the crippled Fukushima nuclear power plant into the sea this summer, concerned South Koreans are stocking up on sea salt.
Conservatives attack financial firms that consider environmental, social and corporate governance issues. But companies in red states won't stop trying to operate more sustainably.
The massive fires in Canada's boreal forests are expected to worsen as the planet warms, but researchers say they're not unprecedented in scale and size.