Hawaii’s Mauna Loa Observatory just captured an ominous sign about the pace of global warming. Atmospheric levels of ...

Originally formed in 1881 by lava flow from Mauna Loa, the caves are now accessible to visitors via a metal ladder. The caves can be wet, dark and muddy, so proceed with caution and pack a ...

There are two active volcanoes in Hawai'i Volcanoes National Park, Mauna Loa and Kilauea, but Kilauea is the real "must-see." A 4,000-foot-tall mountain, Kilauea has been active since Jan. 3 ...

The level of carbon dioxide in the atmosphere measured by a weather station at the Mauna Loa Observatory in Hawaii increased by 3.58 parts per million in 2024 – the biggest jump since records ...