VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY VICTOR DE SCHWANBERG / SCIENCE PHOTO LIBRARY
Global carbon dioxide levels, conceptual image. The increasing levels of carbon dioxide (CO2), more prevalent in the northern hemisphere, is shown in red. CO2 is a greenhouse gas that contributes to global warming. It is produced naturally by plants and animals during respiration, but is also produced by combustion and the burning of fossil fuels. Atmospheric CO2 levels around the world can be measures from orbit by satellite sensors.
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