Closing Mauna Loa and three other U.S. sites that track greenhouse gases would disrupt a decades-long record of the planet’s ...

This photo was taken by a Hawaiian Volcano Observatory monitoring webcam just before 6 a.m. July 9, 2025, during Episode 28 ...

The Mauna Loa laboratory in Hawaii has measured atmospheric carbon dioxide, which — along with other planet-warming pollution ...

The greenhouse effect was discovered more than 150 years ago and the first scientific paper linking carbon dioxide levels in ...

Mauna Loa released about 15,000 tons of carbon dioxide per day during its 1984 eruption, according to USGS data. That’s equivalent to the annual emissions from 2,400 sport utility vehicles.

Just 21 miles east of Mauna Loa, Kilauea’s ongoing eruption is now confined to a lake of lava rippling at its summit. But the history of this volcano is painful for Hawaii’s Big Island.

Mauna Loa, the world's largest active volcano, is sending signals that it might erupt as it is in a state of heightened unrest, according to Hawaii officials.

About two weeks after Earth’s largest active volcano began erupting, Mauna Loa has gone quiet. So, too, has Kilauea, its smaller neighbor on Hawaii’s Big Island, which had been erupting almost ...

And while the smaller shield volcano on Mauna Loa’s eastern slope garners international attention for its tantrums, its big sibling has been slumbering since it last erupted in 1984.

The world's largest active volcano, Mauna Loa on Hawaii's Big Island, has started to erupt for the first time since March to April 1984, ending its longest known quiet period ever.

While Mauna Loa is the largest volcano on earth, the way it tends to erupt is not as dangerous when compared to other volcanoes. "Keeping people prepared so they don't get blindsided is important.

Mauna Loa started erupting on Nov. 27, its first eruption since 1984. It also marks the first time since 1984 that Mauna Loa and Kilauea had dual eruptions.