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How Has Agriculture Contributed to Global Warming?

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What is Global Warming? An increase in the earth's average atmospheric temperature that causes corresponding changes in climate that may result from the greenhouse ... – PowerPoint PPT presentation

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Title: How Has Agriculture Contributed to Global Warming?


1
How Has Agriculture Contributed to Global Warming?
2
What is Global Warming?
  • An increase in the earth's average atmospheric
    temperature that causes corresponding changes in
    climate that may result from the greenhouse
    effect.

3
The Greenhouse Effect
  • The retention of part of the Sun's energy in the
    Earth's atmosphere in the form of heat as a
    result of the presence of greenhouse gases.
  • Main gases
  • Water vapor 36-70
  • Carbon Dioxide 9-26
  • Methane- 4-9
  • Ozone- 3-7
  • Nitrous Oxide
  • CFCs
  • Hydrofluorocarbons,
  • Chlorofluorocarbons
  • Sulfur hexafluoride

4
Greenhouse Gases?
  • Carbon Dioxide (CO2)
  • Burning of fossil fuels, solid waste, trees, ag
    . residues
  • Machinery
  • Plant Respiration

5
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6
Methane (CH4)
  • The production and transport of coal, natural
    gas, and oil.
  • Wetlands
  • Manure Management
  • Enteric Fermentation
  • Rice Cultivation
  • Field burning of Ag
  • residues

7
Nitrous Oxide (N2O)
  • Synthetic and organic waste
  • Denitrification and nitrification
  • Production of nitrogen-fixing crops
  • Cultivation of high organic content soils
  • Application of livestock manure to croplands
  • Combustion of fossil fuels
  • Tillage of soil
  • These all directly add nitrogen to the soil,
    which can be converted to N2O.

8
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9
Is Global Warming Human Induced?
  • Videos

10
What Can We Do?
  • Produce and expand renewable energy
  • Increase efficiency
  • Store more carbon in the soil.

11
How Do We Do It?
  • Biofuels
  • Restoring grassland
  • Conserving/planting forests
  • Anaerobic digesters
  • Cover manure pits
  • Use less Nitrogen fertilizer
  • Create shorter flooding periods in rice paddies
  • Direct seeding
  • Chop and spread residues instead of burning
  • Better grazing practices
  • Reduce/eliminate tilling
  • Better management practices!
  • THE CATCH -

12
What Can We Expect for Crop Production from
Global Warming?
  • Increased photosynthesis from higher levels of
    CO2.
  • Higher temperatures higher stress and greater
    respiration that can result in decreased yields.
    It is estimated that for every 1?C increase in
    the mean temperature will result in a 10
    decrease in yield for cereals.
  • Higher temperatures will require higher amounts
    of water to grow a crop.
  • Currently for wheat it takes 1000 tons of water
    to make 1 ton of grain.
  • An increase in the growing season. Thus, this
    can result in greater crop production.
  • A higher frequency of erratic weather that can
    result in wide swings in rainfall and
    temperatures.

13
Solution
  • Do what you can!
  • Make small adjustments that you can afford
  • Spread the word!

http//www.youtube.com/watch?vCmRyJaBPvD0feature
related
14
Sources
  • global warming. (n.d.). Dictionary.com Unabridged
    (v 1.1). Retrieved November 28, 2008, from
    Dictionary.com websitehttp//dictionary.reference
    .com/browse/global warming
  • greenhouse effect. (n.d.). The American Heritage
    Science Dictionary. Retrieved November 28, 2008,
    from dictionary.com websitehttp//dictionary.refe
    rence.com/browse/greenhouse effect
  • US EPA. (n.d.). Nitrous Oxide Sources and
    Emissions. Retrieved November 28, 2008, from
    http//www.epa.gov/nitrousoxide/sources.html
  • EPA. (2008.). Inventory of U.S. Greenhouse Gas
    Emissions and Sinks 1990-2006. Retrieved
    November 27,2008, from http//www.epa.gov/climatec
    hange/emissions/usinventoryreport.html
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