The "Keeling curve" showing CO₂ measurements at Mauna Loa,Hawaii,shows that concentrations of CO₂ have reached approximately what level,in parts per million (PPM)? A)1,000 ppm B)400 ppm C)350 ppm D)200 ppm E)100 ppm

Question

Quizplus · Accepted Answer

The Keeling Curve, which measures CO2 levels at Mauna Loa, Hawaii, shows that CO2 concentrations have surpassed 400 ppm.

The "Keeling Curve" Showing CO2 Measurements at Mauna Loa,Hawaii,shows That

The "Keeling Curve" Showing CO₂ Measurements at Mauna Loa,Hawaii,shows That