Fossil fuels like coal and oil contain carbon that plants pulled out of the atmosphere through photosynthesis over many millions of years we are returning that carbon to the atmosphere in just a few hundred. NOAA image, based on data from NOAA Global Monitoring Lab.Ĭarbon dioxide concentrations are rising mostly because of the fossil fuels that people are burning for energy. The long-term trend of rising carbon dioxide levels is driven by human activities. The seasonal cycle of highs and lows (small peaks and valleys) is driven by summertime growth and winter decay of Northern Hemisphere vegetation. This graph shows the station's monthly average carbon dioxide measurements since 1960 in parts per million (ppm). The modern record of atmospheric carbon dioxide levels began with observations recorded at Mauna Loa Observatory in Hawaii.
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