There are less than 60 vaquita porpoises left in the wild and it may be difficult to catch any to protect them.
Incoming US President Donald Trump had threatened to pull out of the deal, calling climate concerns a "hoax".
Baldenegro was known for his fight against illegal logging in the country's Sierra Madre mountain region.
Mount Tambora eruption of 1815 was the largest volcanic eruption in historical records.
Evolution of the wet climate would have driven human population movements in and out of the Sahara.
We are likely to lose the majority of primate species to extinction in the coming decades.
Warring termites and resource competition combine to create weird circular arid grass formations in Namibia.
A strong El Niño effect contributed to last year's record-breaking temperatures.
Swathes of Europe have been covered in a white blanket of thick snow for much of this year.
Wasp populations are booming as springs become warmer and drier, a new study finds.
A site in Kazakhstan appears conducive to the re-introduction of Amur tigers in Central Asia.
Now in its sixth year, the prestigious competition attracts the most compelling imagery in landscape, wildlife, nature, travel and adventure from around the planet.
The Halley VI base is being moved to a more secure location on a floating Antarctic ice sheet.
Shamal winds and unprecedented aridity was responsible for enormous storm.
Ex-Trump adviser Mike McKenna said Arctic drilling was also on the cards.
Max Holmes from the Woods Hole Research Centre explains what thawing permafrost means for the environment and people living in these regions
Disposal by burning or acid baths causes serious health risks to workers, the public and wildlife.
Cambodian forests have been cut down to make way for rubber plantations and fields.
The release of the photos coincided with the Japanese PM's visit to Australia over the weekend.
Over the past week alone, a series of of powerful storms dumped 20 inches (50cm) of precipitation on some areas.
Storm chaser Mike Olbinski captures lightning, tornadoes and dramatic cloud formations in stunning images that convey the awesome power and beauty of nature.
The blizzard conditions that have caused travel misery and power cuts in northern Britain are moving slowly southwards.
Barack Obama thinks the green energy movement is unstoppable, but sustainability experts are not so sure.
The enormous Cuvette Centrale peatland holds about 30 billion tonnes of carbon.
This cold snap has now been blamed for at least 69 deaths, with homeless people and migrants among those most at risk.
Facebook, Google and Apple all receive top marks in 'clicking clean' analysis.
El Niño and the Pacific Decadal Oscillation also lead to a build-up of toxins in shellfish.
Extreme conditions have hit areas of southern Europe more used to mild winters.
Barack Obama has a good reputation when it comes to the environment, but he left quite a few loose ends.
Industry, weather and geography conspire to make Beijing a hotspot for toxic smog.