For 67 years, the observatory on Hawaii's Mauna Loa volcano has been taking these measurements daily  — tracking the invisible gas that is building up in our atmosphere and changing life on Earth.

Atmospheric concentrations of carbon dioxide made history last month by climbing to their highest seasonal peak available in historical records, a team of researchers reported. For the first time ...

For the first time on record, monthly average CO2 levels exceeded 430 parts per million (ppm), according to experts at ...

For the first time on record, monthly average CO2 levels exceeded 430 parts per million (ppm), according to experts at ...

Another year, another record,” quipped Ralph Keeling, head of the Scripps CO2 Program, as atmospheric carbon dioxide hit 430 ...

New data shows that CO2 levels have broken through 430 parts per million, an indication that human-caused global warming will ...

Last year, the average level of carbon dioxide rose faster over the previous year than at any other point since the ...

For the first time, the seasonal peak of carbon dioxide concentrations in the atmosphere exceeded 430 parts per million (ppm) ...

Since carbon dioxide is a greenhouse gas, the steady increase has significant implications for global warming.

An aerial view shows a bomb detonating on Mauna Loa during a 1935 eruption. The U.S. Army dropped 20 600-pound bombs on the lava flow that December morning to divert the molten rock from reaching ...