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Human Activity and Greenhouse Gases

Human Activity and Greenhouse Gases. - growing evidence over the last few decades suggest that current warming trend is due to humans (anthropogenic) a. Industrialization

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Human Activity and Greenhouse Gases

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  1. Human Activity and Greenhouse Gases - growing evidence over the last few decades suggest that current warming trend is due to humans (anthropogenic) a. Industrialization • the industrial revolution began in the late 1700’s was possible due to the burning of fossil fuels (coal, oil and natural gas) • this placed a high amount of gasses and pollutants into the atmosphere

  2. Human Activity and Greenhouse Gases b. Deforestation • an decrease of forests due to logging and farming Effect: less carbon dioxide (CO2) absorbed by trees leading to a greater concentration of the gas in the atmosphere

  3. Greenhouse Gases • Water Vapour (H2O) - 1 – 4% of Earth’s atmosphere • responsible for 65 to 85% of the greenhouse effect • however, since not added to or removed from the atmosphere by humans it is not considered a “pollutant”

  4. Greenhouse Gases • Carbon Dioxide (CO2) • responsible for 72% of “pollutant” emissions • has risen from 315 ppm in 1960 to 370 ppm in 2000

  5. Greenhouse Gases 3. Methane (CH4) • responsible for 18% of “pollutant” emissions • created by the decomposition of organic material

  6. Greenhouse Gases 4. Nitrous Oxides (N2O) • responsible for 9% of “pollutant” emissions • formed when nitrogen-rich compounds are broken down by bacteria

  7. Greenhouse Gases • Fluorocarbons • chemicals used as coolants in refrigerators and air conditioners • responsible for destroying the ozone layer

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