How Do You Measure Greenhouse Gases?
 They’re invisible and odorless yet all around us. They float in the air in tiny amounts yet have profound impacts on our world. The challenge of reducing their concentrations has given rise to global treaties, billions of dollars in government and corporate spending and impassioned political debates.
They’re greenhouse gases — a coterie of airborne molecules that trap light radiating from Earth’s surface, warming the planet and making extreme weather more likely and destructive. So serious is the global warming problem that in 1994, the nations of the world committed themselves to stabilize greenhouse gas concentrations “at a level that would prevent dangerous anthropogenic (human-induced) interference with the climate system.”
Yet 30 years later, the world is still struggling to rein in these troublesome gases.
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