National Aeronautics and Space Administration

NASA's Vision is to reach for new heights and reveal the unknown for the benefit of humankind.

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    • octubre 2020
      Fuente: National Aeronautics and Space Administration
      Subido por: Knoema
      Acceso el: 20 octubre, 2020
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      Ozone is a gas made up of three oxygen atoms (O3). It occurs naturally in small (trace) amounts in the upper atmosphere (the stratosphere). Ozone protects life on Earth from the Sun’s ultraviolet (UV) radiation. In the lower atmosphere (the troposphere) near the Earth’s surface, ozone is created by chemical reactions between air pollutants from vehicle exhaust, gasoline vapors, and other emissions. At ground level, high concentrations of ozone are toxic to people and plants.  The maximum of the daily ozone hole size and the minimum of the Southern Hemisphere daily ozone minimums for each year and the date of occurrence. Date links are to the image for the particular day. There are no data for 1995. 
    • septiembre 2021
      Fuente: National Aeronautics and Space Administration
      Subido por: Knoema
      Acceso el: 30 septiembre, 2021
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      Carbon dioxide (CO2) is an important heat-trapping (greenhouse) gas, which is released through human activities such as deforestation and burning fossil fuels, as well as natural processes such as respiration and volcanic eruptions. 
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