GLG 121 Lecture Notes - Lecture 10: Soil Management, Hair Spray, Chlorofluorocarbon
12 Dec 2016
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Document Summary
Composition of air : 78. 084% = nitrogen, 20. 946% = oxygen, 0. 038% = carbon dioxide, argon and others are concentrated in very small amounts. What is climate change: change in the distribution of weather patterns over a period of time, global warming can cause climate change. Causes of global warming: the greenhouse effect: the greenhouse effect. Some of the radiated heat is trapped by ghgs. Sun and heat from the ghgs = an increase in global temperature over. Common greenhouse gases time: carbon dioxide, methane, nitrous oxide, water vapor (sometimes, cholorofluorocarbons (cfcs) Temperature and co2 levels are linked: more co2, higher temperatures. Methane: 20x more powerful than co2 for trapping heat, atmospheric lifetime is 12 years, emitted by landfills and industry; released by warming permafrost and oceans, emitted by livestock. 1. 5 billion cows on earth: 310x more powerful than co2 in trapping heat, atmospheric lifetime is 112 years, from tropical deforestation, fossil fuels and industry, produced by agriculture.
