Seeing red: North’s CO2 hits new peak

Global values met or exceeded 400 parts per million in air

By Beth Mole, 17:10 PM June 16, 2014

April 2014 was the first month in recorded history where average carbon-dioxide levels across the northern half of the world measured at least 400 parts per million (ppm) in air. A United Nations agency reported the new record on May 26.

High above Earth’s surface, carbon dioxide acts as what physicists call a greenhouse gas. The term gets its name from the fact that like the window on a greenhouse, this gas allows sunlight to pass through to the lower atmosphere and ground, where it heats thi...

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