30 Jul '11, 12pm

How we know we're causing global warming in a single graphic

In 1859, physicist John Tyndall ran an experiment demonstrating the greenhouse effect. Visible sunlight easily passes through our atmosphere to warm the Earth. However, invisible heat rays rising from the Earth’s surface, otherwise known as infrared radiation, don’t easily escape back to space. What Tyndall showed by shining heat rays through tubes filled with different gases is that certain gases like water vapour and carbon dioxide block the heat rays. These became known as greenhouse gases. Tyndall also made several predictions of what we should expect to see if greenhouse gases were causing warming (Tyndall 1861 ). In fact, we expect to see a number of distinctive greenhouse patterns in global warming. Observing these patterns strengthens the evidence that humans are causing global warming, as well as eliminates other possible natural causes. Let's have a look at the m...

Full article: http://www.skepticalscience.com/How-we-know-were-causing-...

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How we know we're causing global warming in a single graphic

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