Arctic Ocean reaches chemical tipping point 

A new study published in Communications Earth & Environment suggests that climate change has triggered a major and potentially irreversible transformation in the chemistry of the Arctic Ocean, with significant consequences for marine ecosystems and the global climate system. Researchers have found that the rapid decline of Arctic sea ice has caused a substantial reduction …

AI tracks algal blooms from space

NASA scientists have developed a new artificial intelligence system designed to address one of the most persistent environmental and public health challenges affecting coastal waters: the detection and monitoring of harmful algae outbreaks. The research, recently published in the journal Earth and Space Science, demonstrates how AI can combine data from multiple satellites to identify …

Earth’s outer core changes direction

Scientists have gained new insights into the dynamic processes occurring deep inside Earth after discovering an unexpected reversal in the movement of molten iron within the planet’s core. By analyzing satellite observations and ground-based measurements collected between 1997 and 2025, researchers found that a large region of liquid iron beneath the equatorial Pacific unexpectedly shifted …

GCM reveals drivers of ice age climate

Over the past 2.58 million years — a period scientists call the Quaternary — Earth’s climate has swung repeatedly between cold glacial periods and warmer interglacials. A new study in Nature Communications uses a GCM (General Circulation Model) paired with a faster statistical model called an emulator to investigate what drives these shifts. Because running …

Stratosphere cooling explained

Earth’s atmosphere is responding to rising carbon dioxide in a way that reveals one of the clearest signatures of human-caused climate change. While temperatures at Earth’s surface and in the lower atmosphere continue to rise, the stratosphere—the atmospheric layer extending from roughly 11 to 50 kilometers above Earth—has been cooling for decades. Scientists have recognized …

Relamination and the growth of continents

New research led by scientists at the National Museum of Natural Sciences has identified a major geological process that helps explain how Earth’s continents have evolved over billions of years. The study focuses on a mechanism known as relamination, which occurs during continental collisions when one tectonic plate is forced beneath another through subduction. Rather …