Tehran officials shut schools on Monday as the first of the winter's heavy pollution hit the Iranian capital.

A blanket of choking brown-white smog descended on the city on Sunday, blocking out the view of the mountains that line its northern edge and leading many of its 14 million residents to retreat indoors or don face masks in the street. 

U.S. Secretary of State John Kerry made an impassioned plea Sunday for America to maintain action on global warming, despite the election of climate-change denier Donald Trump.

Secretary of State John Kerry became the highest-ranking U.S. government official to visit Antarctica Friday, citing global risks of climate change and the importance of aggressive action to counter it.

Most life on Earth is already being changed by the warming climate, even though the rise in global temperature since pre-industrial times has been rather slight, researchers warned on Thursday.

The study in the journal Science found that 82 percent of key ecological processes -- including genetic diversity and migration patterns -- are being altered by global warming.

The United States will likely fail to meet its pledges under the landmark Paris climate pact to reduce greenhouse gas emissions, analysts said Thursday on the margin of U.N. climate talks.

Supermarket obsession with perfect looking produce and the use of arbitrary "best before" labels are causing massive food waste that if reversed could feed the world's hungry, a U.N. panel said Thursday.

British primatologist and renowned environmentalist Jane Goodall said Thursday that those who care for the planet would have to work harder in response to Donald Trump's shock US presidential election victory.

Stunned participants at UN climate talks in Marrakesh insisted Wednesday that climate change denier Donald Trump cannot derail the global shift to clean energy, although some called his victory in US presidential elections a "disaster".

In the arid mountains of eastern Morocco, people know the value of water all too well. 

"Every drop is like gold. It should almost be measured by the carat," said local activist Najib Bachiri.

Climate change has made deadly heatwaves and hurricanes, along with droughts and flooding, both more frequent and more intense in recent years, according to a U.N. report released Tuesday.