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GIZMOS CARBON CYCLE

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GIZMOS CARBON CYCLE GIZMOS CARBON CYCLE GIZMOS CARBON CYCLEAtmospheric carbon dioxide Carbon dioxide is a “greenhouse gas” that helps to trap heat in Earth’s atmosphere. In the 1800s, atmospheri ... c concentrations of carbon dioxide were about 280 parts per million (ppm). In 2016, the concentration is 400 ppm, an increase of over 40%. In the same period of time, global temperatures have risen by an average of about 1 °C, or about 2 °F. Recent years have also been some of the warmest ever recorded. Most scientists agree that the increasing CO2 levels and warming climate are related GIZMOS CARBON CYCLE to the burning of fossil fuels and other human activities. On a geological time scale, today’s atmospheric carbon dioxide concentrations are actually relatively low, even including the recent increase. For much of Earth’s history, very high atmospheric carbon dioxide levels resulted in a “greenhouse Earth” that lacked polar ice and featured vast inland seas that covered large swaths of the continents. [Show More]

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