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FRANCE: Government scientists in the US say they have directly observed for the first time the greenhouse effect in action, while monitoring the way carbon dioxide in the Earth’s atmosphere absorbed increasing amounts of thermal radiation from the surface.
Their measurements, taken over a period of 11 years in Alaska and Oklahoma, confirm predictions made more than 100 years ago, and repeatedly examined: there is a greenhouse effect, and the greenhouse gas that most helps the world warm is carbon dioxide.
The phenomenon is known in climate science shorthand as radiative forcing, which happens when the Earth absorbs more energy from solar radiation than it emits as thermal radiation back into space.
The sun shines through the greenhouse gases as if they were glass, and warms the rocks. The rocks emit infra-red waves, but the transparent gases now keep the heat in, as if they formed the glass roof of a greenhouse.
