Within a decade the world will never see days even in the cleanest of places on days in the fall when greenhouse gases are at their lowest when the carbon measurement falls below 400 ppm, said James Butler, director of global monitoring at the National Oceanic and Atmospheric Administration's Earth Science Research Lab in Boulder, Colo.

NPR: Experts: CO2 Record Illustrates 'Scary' Trend

The Mauna Loa monitoring station is operated by the U.S. National Oceanic and Atmospheric Administration (NOAA) and sits at an altitude of about 12, 000 ft in the middle of the Pacific.

FORBES: Atmospheric Carbon At All-Time-High

During the first 12 weeks after Curiosity landed in an area named Gale Crater, an international team of researchers analyzed data from more than 20 atmospheric events with at least one characteristic of a whirlwind recorded by the Rover Environmental Monitoring Station (REMS) instrument.

ENGADGET: Curiosity rover finds radiation levels on Mars are safe for humans