The Antarctic Circumpolar Current could only develop once wind patterns aligned with new ocean passages 34 million years ago, a new study suggests.
Grace van Deelen
Grace van Deelen, joined Eos in 2023 as a staff writer. She covers all things Earth science and is particularly interested in stories that highlight the intersection of society, the environment, and equity in science. Grace holds a master’s degree from MIT’s Graduate Program in Science Writing and bachelor’s degrees in biology and anthropology from Tufts University.
Posted inResearch & Developments
Temperatures in Nearly All Major U.S. Cities Have Warmed Since First Earth Day
After more than half a century of Earth Days, one planetary challenge—climate change—threatens our planet more than ever.
In 1970, the year Sen. Gaylord Nelson, D-Wisc., organized the first Earth Day events, the annual average concentration of carbon dioxide in the atmosphere was 326 parts per million. In 2025, it was 31% higher, at 427 parts per million.
Posted inNews
As Ice Recedes and Land Rebounds, Antarctica’s Mineral Resources Come into Focus
Melting ice, rebounding land, and rising seas will change what resources are available in Antarctica, a new analysis finds.
Posted inResearch & Developments
Arctic Winter Sea Ice Hits a Record Low, Again
Sea ice in the Arctic has likely hit its maximum extent for the year, the National Snow and Ice Data Center (NSIDC) said on 26 March. That maximum extent is one of the lowest ever recorded, tying last year’s record for the least sea ice coverage in the 48-year observational record.
Posted inNews
Apollo Samples Told a Conflicting Story About Lunar Magnetism, Until Now
Observations suggested the Moon had both a weak and strong magnetic field in the distant past. A new study presents a theory accommodating all the evidence.
Posted inNews
These Underprotected Brazilian Wetlands Store Carbon with Staggering Density
The Cerrado, largely overlooked in climate science and policy, is a critical carbon sink, according to new research.
Posted inNews
Thousands Rally to Support the Need for Science in a Democracy
Dozens of Stand Up for Science gatherings nationwide focused on the importance of science for federal policymaking.
Posted inResearch & Developments
Antarctic Ice Sheet Has Lost a Connecticut-Sized Amount of Ice Over the Past 30 Years
A new study of Antarctica has found that since 1996, its ice sheet has lost 12,820 square kilometers (nearly 5,000 square miles) of ice—nearly enough to cover the state of Connecticut, or 10 cities the size of Greater Los Angeles.
Posted inResearch & Developments
After Restructuring, NSF Wants to Hire More Staff but Reduce Solicitations
After large reductions in staffing last year, the National Science Foundation (NSF) is now seeking to hire more employees.
Posted inNews
With the Ocean Included, the Social Cost of Carbon Doubles
A new calculation includes ocean ecosystems when assessing the monetary impact of climate change.