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  2. Great Oxidation Event - Wikipedia

    en.wikipedia.org/wiki/Great_Oxidation_Event

    The Great Oxidation Event (GOE) or Great Oxygenation Event, also called the Oxygen Catastrophe, Oxygen Revolution, Oxygen Crisis or Oxygen Holocaust, [2] was a time interval during the Earth's Paleoproterozoic era when the Earth's atmosphere and shallow seas first experienced a rise in the concentration of free oxygen. [3]

  3. Airborne fraction - Wikipedia

    en.wikipedia.org/wiki/Airborne_fraction

    The global carbon dioxide partitioning (atmospheric CO 2, land sink, and ocean sink) averaged over the historical period (1900–2020) The airborne fraction is a scaling factor defined as the ratio of the annual increase in atmospheric CO 2 to the CO 2 emissions from human sources. [1]

  4. Carbon–oxygen bond - Wikipedia

    en.wikipedia.org/wiki/Carbon–oxygen_bond

    A carbon–oxygen bond is a polar covalent bond between atoms of carbon and oxygen. [1] [2] [3]: 16–22 Carbon–oxygen bonds are found in many inorganic compounds such as carbon oxides and oxohalides, carbonates and metal carbonyls, [4] and in organic compounds such as alcohols, ethers, and carbonyl compounds.

  5. Biological carbon fixation - Wikipedia

    en.wikipedia.org/wiki/Biological_carbon_fixation

    The majority of the fixation occurs in terrestrial environments, especially the tropics. The gross amount of carbon dioxide fixed is much larger since approximately 40% is consumed by respiration following photosynthesis. [5] [6] Historically, it is estimated that approximately 2×10 11 billion tons of carbon has been fixed since the origin of ...

  6. Wheeler Express - Wikipedia

    en.wikipedia.org/wiki/Wheeler_Express

    The Wheeler Express (or later known as EDI Express) is a four-seat low-wing composite homebuilt aircraft. Wheeler Express takeoff. Development.

  7. US govt wants half of its $20 billion loan to Ukraine to be ...

    www.aol.com/news/us-govt-wants-half-20-164120000...

    WASHINGTON (Reuters) -The Biden administration is trying to provide Ukraine with $10 billion in military aid as part of its $20 billion commitment to the country under a $50 billion loan ...

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