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        Part of EARTH A New Wild
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        The Keeling Curve | EARTH A New Wild

        The Keeling Curve, a graph of the atmosphere's carbon dioxide concentration beginning in 1958, demonstrates how gas composition changes annually with the Earth's seasons. During the autumn and winter when leaves decay, the concentration of carbon dioxide increases; during the spring and summer when plants can photosynthesize, the concentration decreases. Over a long-enough span of time, scientists can detect a steady rise in mean carbon dioxide concentrations, indicative of global climate change.

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