For nearly a million years, carbon dioxide levels in the atmosphere have maintained an average of about 280 ppm, not going above 300 ppm or below 160 ppm. Global warming (and cooling) trends have ...

More than two miles above the Pacific surf, at the summit of the world's largest volcano, the evidence of human influence on global warming is in the air. For a half century, sensors atop Mauna ...

Last year, the average level of carbon dioxide rose faster over the previous year than at any other point since the recordings began, Scripps reported in January. The average readings for the 12 ...

Carbon dioxide acts like Earth’s thermostat: The more of it in the air, the more the planet warms. In 2023, global levels of the greenhouse gas rose to 419 parts per million, around 50 percent ...

A misleading bar chart comparing modern carbon dioxide (CO2) levels to those millions of years before humans existed ignores a large CO2 increase during the human era that has changed the climate ...

The year 2016 set yet another devastating record for global warming. Carbon dioxide levels rose more than 2 parts per million (ppm) for the second year in a row, according to the National Oceanic a… ...

For the first time in recorded history, the concentration of atmospheric carbon dioxide, or CO2, was measured at more than 420 parts per million at the Mauna Loa Observatory on the Big Island of ...

Mauna Loa has been continuously monitoring atmospheric CO2 levels — which fluctuate according to season but continue to climb annually — since 1958. The United Nations says emissions from energy, food ...

Carbon dioxide is released into the atmosphere. CO2 levels peak every year in May , just as spring begins in the Northern Hemisphere before plants reach full bloom and absorb the gas.