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Download 11.2 Human Activity and Climate Change (change in long term
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Transcript
11.2 Human Activity and Climate Change (change in long term weather patterns) Global Warming An increase in global average temperature The average global temp has risen 0.74ºC from 1906-2005 Predictions say an increase of 1-2.5ºC in 50 years and 6ºC in next 100 years Enhanced Greenhouse Effect The increased ability of the atm to absorb and emit thermal energy (because of greenhouse gases) GWP- Global Warming Potential- describes the ability of a substance to warm the atm Greenhouse Gases GWP Greenhouse Gas Carbon dioxide Atm Lifetime (years) Source Global Warming Potential (GWP) Variable Fossil fuels Deforestation 1 Methane 12 Fossil Fuels Livestock Waste Rice paddies 25 Nitrous oxide 114 Chemical fertilizers Burning waste/ fossil fuels Industry 298 CFCs 45 Liquid coolants Refrigeration AC 4750-5310 Global Warming 101 National Geographic Albedo and Climate Albedo affects the amount of solar radiation sea ice melts = lowers albedo = more radiation = higher temp Reading Check What is the difference between the natural Greenhouse effect and the enhanced greenhouse effect? What does GWP describe? List 3 greenhouse gases that are released when fossil fuels are burned Name a greenhouse gas that does not occur naturally What has a higher albedo: sea ice or soil? Role of science- Understanding Climate Change General Circulation Models (GCMs) are computer models designed to study climate Provide predictions of future conditions based on multiple factors International Cooperation Intergovernmental Panel on Climate Change (IPCC) was formed Investigate human’s contribution to Global Warming Experts from 130 countries Potential Global Impacts of Climate Change Main fisheries affected (trade decrease) Sea level rise Deforestation (increase forest fire risk) Water shortage Disease risk Increase severity and frequency of storms Decreasing crop yields Change in biomes (Canada’s permafrost) Uncertainty and Decision Predictions about climate change cannot be certain Two extreme scenarios to consider: 1. Climate change will not greatly affect our lives or our environment 2. Climate change will cause drastic changes in weather patterns that will greatly affect our lives and environment What would be the consequence of not acting? Strategies for Addressing Climate Change
