The agency’s proposal to tighten standards for small-particulate pollution has prompted opposing calls for tighter and looser regulations.
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Hypoxia Affects One in Eight Rivers Worldwide
A global study found dangerously low levels of dissolved oxygen in rivers around the world. The true prevalence of hypoxia is probably even higher.
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Marine Life May Be Headed to Higher Latitudes
Researchers tracked plankton through a changing climate over 8 million years. Now, that knowledge is helping scientists understand the coming effects of warming oceans.
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Cities Are Rethinking What Kinds of Trees They’re Planting
U.S. cities are losing some 36 million trees every year, but hardier species can restore their canopies.
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Ten Rivers Facing Pollution, Development, and Climate Change—And Policies That Can Help
An annual report highlights 10 waterways that have arrived at forks: where public support could determine whether they receive protection.
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Asteroid Impacts Could Have Warmed Ancient Mars
Hydrogen released during large impacts might have boosted Mars’s surface temperature above freezing for thousands or even millions of years, enabling liquid water to flow over the Red Planet.
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As the Arctic Warms, These Rivers Are Slowing Down
The Arctic is warming up, but instead of large rivers migrating faster, they’re actually slowing down because of shrubification.
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Biden Administration Considers Unprecedented Solution to Colorado River Crisis
As Colorado River Basin states prove unable to reach a consensus in reducing their water consumption, the U.S. Department of the Interior is investigating an option that defies the Law of the River.
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Wildfire Smoke Destroys Ozone
Smoke aerosols from large wildfires are the perfect reaction surface for chlorine chemicals, speeding their transformation from ozone-friendly forms to reactive ones.
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Felt Reports Could Shake Up Earthquake Response
Firsthand accounts of earthquake impacts could aid in identifying people who require help as well as increasing safety in some areas.