Five Sikh men hiking in British Columbia’s Golden Ears Provincial Park rescue two hikers stranded on a narrow ledge by tying their turbans and jackets together to form a 33-foot makeshift rope.  

A lost hiker in Colorado ignores repeated phone calls from would-be rescuers because they didn’t recognize the number.  

Testifying before Congress, the heads of the country’s largest oil companies deny that they have deceived the public about climate change. 

The world’s richest nations have fallen short in providing the $100 billion a year that they promised to help developing nations address climate change.

Carbon sinking: If whale populations were restored to pre-whaling levels, their natural deaths would sequester 1.7 billion tons of carbon a year on the ocean floor.

Saudi Arabia says it will reach “net zero” carbon emissions by 2060.

Barcelona offers free public transit for three years to citizens who ditch their inefficient cars.

Hertz orders 100,000 Teslas, pushing the company’s valuation over $1 trillion. 

Nevada becomes the 16th state to adopt Clean Car Standards. 

For the first time, astronomers detect a planet outside the Milky Way galaxy.

Another species of early human joins the family: Homo bodoensis.  

An “atmospheric river” ends Northern California’s record dry spell, extinguishing wildfires, partially replenishing reservoirs, and adding 20 billion gallons of water to Lake Tahoe, raising the mammoth lake by five inches. 

New York denies permits for two new gas-fired power plants, saying that they are incompatible with the state’s greenhouse-gas-reduction goals. 

Two condor chicks hatched at the San Diego Zoo are the products of asexual reproduction, or parthenogenesis, even though their mothers were housed with fertile males.