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Kids born in 2020 worldwide will experience twice the number of wildfires during their lifetimes compared with those born in 1960. In California and other western states, frequent wildfires have become as much a part of summer and fall as popsicles and Halloween candy. Wildfires produce fine particulate matter, or PM₂.₅, that chokes the air and penetrates deep into lungs. Researchers know that short-term exposure to wildfire PM₂.₅ increases acute care visits for cardiorespiratory problems such as asthma. However, the long-term effects of repeated exposure to wildfire PM₂.₅ on chronic health conditions are unclear. One reason is that scientists have not decided how best to measure this type of intermittent yet ongoing exposure. Environmental epidemiologists and health scientists like us usually summarize long-term exposure to total PM₂.₅ – which comes from power plants, industry and transportation – as average exposure...

Hunting large carnivores is a contentious issue in wildlife management and conservation. It’s on the ballot in fall 2024 in Colorado, where voters will consider Proposition 127, a proposed ban on hunting and trapping of mountain lions, bobcats and lynx in the state. Wildlife agencies often use regulated hunting as a tool for controlling carnivore populations, reducing their impacts on vulnerable wildlife or minimizing the risk of conflict between carnivores and people, pets and livestock. But scientific studies have questioned how effectively recreational hunting achieves these goals. And public attitudes are shifting as participation in hunting declines. We direct Colorado State University’s Center for Human-Carnivore Coexistence and Animal-Human Policy Center. Together with our colleague Benjamin Ghasemi, we recently surveyed Colorado residents about their perceptions of hunting mountain lions and black bears in the state. We found that support for hunting depen...

Across Appalachia, September marks the start of ginseng season, when thousands of people roam the hills searching for hard-to-reach patches of this highly prized plant. Many people know ginseng as an ingredient in vitamin supplements or herbal tea. That ginseng is grown commercially on farms in Wisconsin and Ontario, Canada. In contrast, wild American ginseng is an understory plant that can live for decades in the forests of the Appalachian Mountains. The plant’s taproot grows throughout its life and sells for hundreds of dollars per pound, primarily to East Asian customers who consume it for health reasons. Because it’s such a valuable medicinal plant, harvesting ginseng has helped families in mountainous regions of states such as Kentucky, West Virginia, Tennessee, North Carolina and Ohio weather economic ups and downs since the late 1700s. Most harvesting takes place in Appalachia’s long-enduring forest commons – forests across the region that histo...

Imperial County consistently ranks among the most economically distressed places in California. Its Salton Sea, the state’s biggest and most toxic lake, is an environmental disaster. And the region’s politics have been dominated by a conservative white elite, despite its supermajority Latino population. The county also happens to be sitting on enough lithium to produce nearly 400 million batteries, sufficient to completely revamp the American auto fleet to electric propulsion. Even better, that lithium could be extracted in a way consistent with broader goals to reduce pollution. The traditional ways to extract lithium involve either hard rock mining, which generates lots of waste, or large evaporation ponds, which waste a lot of water. In Imperial Valley, companies are pioneering a third method. They are extracting the mineral from the underground briny water brought up during geothermal energy production and then injecting that briny water back into the ground in a...

Imagine a bee crawling into a bright yellow flower. This simple interaction is something you may have witnessed many times. It is also a crucial sign of the health of our environment – and one I’ve devoted hundreds of hours of field work observing. Interactions between plants and pollinators help plants reproduce, support pollinator species like bees, butterflies and flies, and benefit both agricultural and natural ecosystems. These one-on-one interactions occur within complex networks of plants and pollinators. In my lab at the University of Colorado Boulder, we’re interested in how these networks change over time and how they respond to stressors like climate change. My team emphasizes long-term data collection in hopes of revealing trends that would otherwise be unnoticed. Working at Elk Meadow Ten years ago, I began working in Elk Meadow, which is located at 9,500 feet (or 2,900 meters) elevation at the University of Colorado’s Mountain Resear...