Mauna Loa is still active, and the weather can change ... you will be given a gate code before your arrival. After you climb the difficult first 2.7 miles, you'll likely want to stop overnight ...

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 ...

It shares a significant portion of the same climbing route before diverging ... is not as impressive as other peaks. Mauna ...