Local climate activists in Congo are hoping Pope Francis' visit will help spur action to protect the country's rainforest from oil and gas interests.

The Pope's call to protect Congo's "great green lungs of the world" on Tuesday was welcomed by campaigners who see the papal visit as a fresh opportunity to highlight threats to the country's biodiversity and global climate goals.

In a small lab nestled in Brazil's Atlantic Forest, researchers with gloved hands and masked faces cradle four tiny golden monkeys so a veterinarian can delicately slide a needle under the thin skin of each sedated animal's belly.

The next morning, biologist Andréia Martins brings them to the precise spot where they were caught. She opens the wire cages and the monkeys dart out, hopping to a tree or the ground, ascending the canopy and regrouping as a family. They chatter noisily as they vanish into the rainforest.

A mess of ice, sleet and snow lingered across much of the southern U.S. as thousands in Texas endured freezing temperatures with no power, including many in the state capital of Austin, but a warming trend was forecast to bring relief from the deadly storm Thursday.

However, an Arctic cold front is expected to move from Canada into the northern Plains and Upper Midwest and sweep into the Northeast by Friday, bringing snow and bitter cold with windchills of more than minus 50 (minus 45 Celsius) in northern New England, according to the National Weather Service.

Braving the bitter cold, Lebanese villagers have been patrolling a mountainside in the country's north, trying to protect trees from loggers who roll in under the cover of darkness. 

Near his village of Ainata, "nearly 150 centuries-old oak trees have been felled" in the past year, said Ghandi Rahme, pointing at the tree stumps in the rocky ground around him.

Black buffaloes wade through the waters of Iraq's Mesopotamian marshes, leisurely chewing on reeds. After years of drought, winter rains have brought some respite to herders and livestock in the famous wetlands.

Exposed to the beating sun and hot dry air, more than 10% of the water carried by the Colorado River evaporates, leaks or spills as the 1,450-mile (2,334-kilometer) powerhouse of the West flows through the region's dams, reservoirs and open-air canals.

For decades, key stewards of the river have ignored the massive water loss, instead allocating Arizona, California, Nevada and Mexico their share of the river without subtracting what's evaporated.

The world will likely breach the internationally agreed-upon climate change threshold in about a decade, and keep heating to break through a next warming limit around mid-century even with big pollution cuts, artificial intelligence predicts in a new study that's more pessimistic than previous modeling.

The study in Monday's journal Proceedings of the National Academy of Sciences reignites a debate on whether it's still possible to limit global warming to 1.5 degrees Celsius, as called for in the 2015 Paris climate agreement, to minimize the most damaging effects of climate change. The world has already warmed 1.1 or 1.2 degrees since pre-industrial times, or the mid-19th century, scientists say.

A fishing community in southern Brazil has an unusual ally: wild dolphins.

Accounts of people and dolphins working together to hunt fish go back millennia, from the time of the Roman Empire near what is now southern France to 19th century Queensland, Australia. But while historians and storytellers have recounted the human point of view, it's been impossible to confirm how the dolphins have benefited — or if they've been taken advantage of — before sonar and underwater microphones could track them underwater.

At 10:40 a.m. on a day in January, two powerful beams of light from the Svalbard governor's boat pierced the complete darkness of the mountain-fringed fjord it was sailing. It was carrying the children's choir from this remote village's church to visit an even more isolated Arctic outpost.

That's polar night in this Norwegian archipelago – so close to the North Pole the sun is at least six degrees below the horizon from mid-November through the end of January.

Long-haul carrier Emirates successfully flew a Boeing 777 on a test flight Monday with one engine entirely powered by so-called sustainable aviation fuel. This comes as carriers worldwide try to lessen their carbon footprint.

Flight No. EK2646 flew for just under an hour over the coastline of the United Arab Emirates, after taking off from Dubai International Airport, the world's busiest for international travel, and heading out into the Persian Gulf before circling back to land. The fuel powered one of the Boeing's two General Electric Co. engines, with the other running on conventional jet fuel for safety.