Solid waste management

Rats thrive around humans, for good reason: They feed off crops and garbage and readily adapt to many settings, from farms to the world’s largest cities. To control them, people often resort to poisons. But chemicals that kill rats can also harm other animals. The most commonly used poisons are called anticoagulant rodenticides. They work by interfering with blood clotting in animals that consume them. These enticingly flavored bait blocks are placed outside of buildings, in small black boxes that only rats and mice can enter. But the poison remains in the rodents’ bodies, threatening larger animals that prey on them. My colleagues and I recently reviewed studies from around the world that sought to document wild mammal carnivores’ exposure to anticoagulant rodenticides. Many animals tested in these studies were already dead; others were alive and a part of other studies. Researchers detected rodenticides in about one-third of the animals in these analyses, i...

Plastic waste is piling up at a daunting pace around the world. The World Bank estimates that every person on the planet generates an average of 1.6 pounds (0.74 kilograms) of plastic waste daily. To curb this flow, 175 nations are negotiating a binding international treaty on plastic pollution, with a completion target of late 2024. In July 2024, the Biden administration released the first U.S. plan for addressing this problem. The new U.S. strategy covers five areas: plastic production, product design, waste generation, waste management and plastic capture and removal. It also lists actions that federal agencies and departments are currently pursuing. I study environmental law, including efforts to reduce plastic pollution. As the world’s largest economy, the U.S. is a critical player in this effort. Based on my research, here are three proposals in the U.S. plan that I believe are important and one omission that I view as a major gap. As of...

Spring is go time for climbers who hope to summit Mount Everest, Earth’s highest peak above sea level. Hundreds of mountaineers from around the world travel to Asia in April and May, headed for base camps in Nepal and Tibet. But jagged peaks won’t be the only thing they see. Especially on Everest’s more heavily traversed Nepal side, they’ll find fields of garbage – including cans, bottles, plastic and human and animal excrement. Each year, more than 60,000 trekkers and climbers visit the Sagarmatha National Park and Buffer Zone, a high-altitude swath of the Khumbu region in northeast Nepal that includes Everest and seven other peaks. Some 400 to 500 climbers attempt to summit Everest every year. The trash problem first became evident in the 1980s and 1990s, when climbing on the mountain and trekking in Khumbu began to increase. Climber and trekker numbers have further skyrocketed in the past 20 years. Most coverage of this issue focuses on nega...

Plastic pollution has spread to Earth’s farthest reaches, with widespread effects on wildlife, the environment and human health. To curb this problem, U.N. member countries are negotiating a global treaty to reduce plastic pollution, which they aim to complete by the end of 2024. That effort is well underway. In September 2023, the U.N. Environment Programme released the so-called zero draft – a first iteration of ideas and goals that emerged from the first two rounds of negotiations. And in November 2023, the Intergovernmental Negotiating Committee on Plastic Pollution met in Nairobi, Kenya, for the third negotiating round of a planned five sessions. Studies show that plastic causes harm in all stages of its life cycle, from production through use and disposal. Because the draft treaty includes provisions that address all of these phases, environmental advocates greeted it as a step in the right direction. The draft includes 13 provisions that address issues suc...