Scientists found radioactive carbon-14 in the tissues of tiny animals like these that live at the ocean's farthest depths. (Ning Wang) At a Glance A recent study found radioactive carbon-14 in tiny animals that live at the ocean's deepest depths. Researchers say the observation highlights how the compound moves through the food chain."Bomb carbon" is a byproduct of nuclear testing. Even the deepest, darkest depths of the ocean can't escape the radioactive fallout from a nuclear explosion. Scientists recently discovered...

This picture taken on May 21, 2018 shows discarded climbing equipment and rubbish scattered around Camp 4 of Mount Everest. ( Doma Sherpa/AFP/Getty Images) At a Glance Sherpas have removed more than 3 tons of garbage from Mount Everest. Hundreds of climbers and support staff discard their trash on the mountain each year. The cleanup campaign's goal is to collect more than 10 tons of garbage by the end of May. A 14-member team of sherpas sent by the Nepalese...

At a Glance Beaches at Cocos Islands are littered with an estimated 238 tons of plastic, including 977,000 shoes and 373,000 toothbrushes.Half of the plastic produced over the past 60 years was manufactured within the last 13 years. Australia's Cocos (Keeling) Islands is home to more than 400 million pieces of plastic pollution like hundreds of thousands of shoes and toothbrushes. A survey by the University of Tasmania’s Institute of Marine and Antarctic Studies (IMAS) found that beaches on the...