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Unformatted text preview: d. Seasonal Cycling i. CO2 + H2O + Sunlight = CH2O + O2 ii. Intensity of sunlight during different seasons makes the photosynthesis process differ iii. Mauna Loa Record 1. Long term increasing trend of CO2 2. Growth rate is stable- 1.5 ppmv/yr e. Human Influence i. 31 Percent increase of CO2 since 1750 ii. 4 Main Sources: Petroleum, coal, natural gas, cement production 1. Petroleum- major source 2. Coal- long term major source iii. U.S. has the highest greenhouse gas emissions per capita (6.6) iv. Sources for Methane 1. Livestock, cultivated rice patties, burning fossil fuels and biomass, mining 3. Global Carbon Budget a. Without human inputs: reservoirs would be balanced b. Fossil fuels output 5.5 c. Land use change output- 1.6 (.6 reflected) d. Missing carbon sink...
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- Spring '08
- Greenhouse gas, Methane, photosynthesis Decrease CO2