Fresh off the climate strike that took hundreds of thousands of young people out of classrooms and into the streets globally, youth leaders gathered at the United Nations Saturday to demand radical moves to fight climate change. "We showed that we are united and that we, young people, are unstoppable," Swedish 16-year-old activist Greta Thunberg, who started the climate strike movement with her lone protest in front of her country's parliament about a year and a half ago.

Conservationists working around the largest volcano on the Galapagos Islands say they have found 30 giant tortoises partially descended from two extinct species, including that of the famed Lonesome George.

The 28-nation bloc moved closer to banning single-use straws, plates, cutlery and cotton swabs, after officials from EU member states and the European Parliament on Wednesday backed recommendations by its executive branch designed to reduce marine pollution. "When we have a situation where one year you can bring your fish home in a plastic bag, and the next year you are bringing that bag home in a fish, we have to work hard and work fast," said Karmenu Vella, the European commissioner for environment, maritime affairs and fisheries.

After facing near-extinction, mountain gorillas are slowly rebounding. On Wednesday, the Switzerland-based International Union for Conservation of Nature updated mountain gorillas' status from "critically endangered" to "endangered," a more promising, if still precarious, designation. There are now just over 1,000 of the animals in the wild, up from an estimated population of 680 a decade ago.

Teen climate activist Greta Thunberg, who has inspired millions across the world to stage protests urging leaders to better tackle global warming, has declined an environmental prize, saying "the climate movement does not need any more prizes." Two fellow climate activists spoke on Thunberg's behalf at an award ceremony Tuesday in Stockholm for the regional inter-parliamentary Nordic Council's prizes, reading a statement thanking the group for the honor. Thunberg, 16, is currently in California.

Rare salt formations have been documented for the first time on the shores of the Great Salt Lake, and they could yield insights about salt structures found on Mars before they disappear for good. They're showing up now in part because water levels at the largest natural lake west of the Mississippi have been lowered by drought and water diversion, exposing more shoreline. It's a story that's playing out throughout the American West as a growing population puts more demand on scarce water resources.

July was the hottest month measured on Earth since records began in 1880, the latest in a long line of peaks that scientists say backs up predictions for man-made climate change. The U.S. National Oceanic and Atmospheric Administration said Thursday that July was 0.95 degrees Celsius (1.71 degrees Fahrenheit) warmer than the 20th century average of 15.8 C (60.4 F) for the month.

A diplomatic standoff over a single word could set the stage for a bigger showdown during the second half of this year's U.N. climate summit, after just four of nearly 200 countries present — Russia, Saudi Arabia, Kuwait and the U.S., all oil-exporting countries — blocked endorsement of a landmark study on global warming. "It's really an embarrassment for the world's leading scientific superpower to be in this position of having to disbelieve a report that was written by the world's scientific community including a large number of pre-eminent U.S. scientists," said Alden Meyer of the Union of Concerned Scientists.

Dozens of billion-dollar companies. Thousands of high-paying IT and manufacturing jobs. Luxury apartments towering over the Bay of Bengal. The southern Indian city of Chennai has one of the world's fastest-growing economies, but it's out of water, threatening to put a brake on all that growth. Here's a look at the city.

The latest on the U.N. climate conference being held in Poland: Dutch Prime Minister Mark Rutte says politicians need to win over all of society for measures needed to tackle climate change.