Pollution Articles

• Air Quality
  Environmental Issues
  Ozone Holes
  Energy and the Environment
  Air Pollution
  Global Warming
   

  Refrigerant

  A refrigerant is a compound used in a heat cycle that undergoes a phase change from a gas to a liquid and back. The two main uses of refrigerants are refrigerators/freezers and air conditioners. Cf. ... > more
• Agriculture and Food
  Organic
  Food and Agriculture
  Sustainability
  Soil Types
  Food
   
  

  Organic farming

  Organic farming is a form of agriculture that relies on ecosystem management and attempts to reduce or eliminate external agricultural inputs, especially synthetic ones. It is a holistic production ... > more
• Energy and the Environment
  Renewable Energy
  Petroleum
  Energy and Resources
  Environmental Science
  Oil Spills
   
  

  Biodiesel

  Biodiesel refers to a diesel-equivalent, processed fuel derived from biological sources. Though derived from biological sources, it is a processed fuel that can be readily used in diesel-engined ... > more
• Ozone Holes
  Environmental Issues
  Atmosphere
  Air Quality
  Air Pollution
  Pollution
   
  

  Ozone layer

  The ozone layer is the part of the Earth's atmosphere which contains relatively high concentrations of ozone (O3). "Relatively high" means a few parts per million - much higher than the ... > more
• Atmosphere
  Air Quality
  Air Pollution
  Climate
  Geochemistry
  Environmental Issues
   
  

  Earth's atmosphere

  Earth's atmosphere is a layer of gases surrounding the planet Earth and retained by the Earth's gravity. It contains roughly 78% nitrogen and 21% oxygen 0.97% argon and carbon dioxide 0.04% trace ... > more
• Acid Rain
  Landslides
  Ecology
  Environmental Issues
  Air Pollution
  Geochemistry
   

  Humus

  Humus is a complex organic substance resulting from the breakdown of plant material in a process called humification. This process can occur naturally in soil, or in the production of compost. Humus ... > more
• Atmosphere
  Renewable Energy
  Weather
  Climate
  Severe Weather
  Environmental Science
   
  

  Hadley cell

  The major driving force of atmospheric circulation in the tropical regions is solar heating. Because of the Earth's 23.5 ° axial tilt, the sun is never more than a few tens of degrees from ... > more
• Energy and the Environment
  Energy and Resources
  Alternative Fuels
  Renewable Energy
  Automotive and Transportation
  Batteries
   
  

  Alternative fuel vehicle

  Alternative Fuel Vehicle refers to a vehicle that runs on a fuel other than traditional gasoline or diesel; any method of powering an engine that does not involve petroleum. Due to a combination of ... > more
• Global Warming
  Forest
  Air Quality
  Climate
  Rainforests
  Geochemistry
   
  

  Carbon dioxide sink

  A carbon dioxide (CO2) sink is a carbon reservoir that is increasing in size, and is the opposite of a carbon "source". The main natural sinks are the oceans and plants and other organisms that use ... > more
• Climate
  Atmosphere
  Earth Science
  Floods
  Severe Weather
  Global Warming
   
  

  Jet stream

  Jet streams are fast flowing, relatively narrow air currents found in the atmosphere at around 12 km above the surface of the Earth, just under the tropopause. They form at the boundaries of adjacent ... > more

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