GRG 304E Lecture 18 Notes
GRG 304E Lecture 18 Notes GRG 304E
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This 3 page Class Notes was uploaded by Cassidy Schap on Sunday September 27, 2015. The Class Notes belongs to GRG 304E at University of Texas at Austin taught by Thoralf Meyer in Summer 2015. Since its upload, it has received 34 views. For similar materials see Environmental Science: changing world in Geography at University of Texas at Austin.
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Date Created: 09/27/15
Lecture 18global climate change Dealing with it Mitigation moderation or postponement of effects by reducing greenhouse emissions Adaptation response to changes caused by climate change Will require a combo of both Focus on C02 reduction Mitigation develop alternatives to fossil fuels reduce energy use increase energy efficiency plantmaintain rainforests Carbon management trap coZ from smokestacks sequester C02 to geo formations or depleted oilgas wells P watts u volts xJ amps 60 watt bulb times one hour 060 KWh less wattage less time device is on less money you have to pay adaptation move coastal settlements inland construct seawalls on coastal areas prevent saltwater intrusion nd substitute crops to grow on warming land develop heat and drought resistant cropstrees city planning sewer systems and storm runoff ozone 03 human made pollutant in troposphere natural component of stratosphere ozone layer shields earth from UV light ozone thinning occurs naturally over Antarctica has become worse due to human activity ozone quotholequot 70 reduction in 03 over Antarctica 10 reduction over Europe and N America noticeable reduction over arctic causes CFCs coolants aerosol propellants Styrofoam halons re retardant methyl bromide pesticide carbon tetrachloride effects more UV reaches Earth s surface ecosystem disruption damage to wildlife human health problems cataracts skin cancer lowered immunity mitigation and recovery worldwide bans and reductions in use 1978 US bans CFC use as a propellant 1987 montreal protocol50 reduction by 1998 CFCs phased out by developed countries in 1996 2005 in developing CFCs are extremely stable and thus do not leave the atmosphere quickly will take time for the disuse to have an effect on the ecosystem Acid deposition caused by primary air pollutants NOx Sox C02 that form secondary pollutants Combustion of coal produces a lot of sulfur has direct effect on photosynth Damages buildings Changes the soil chemistry changes the pH values WATER essential and stuff Its like what we re made of duh Human are 60 water cool Dist is uneven across the planet tons in Canada none in morocco Always something wrong too much too little bad quality etc 2 kinds salt and fresh minority is fresh surface water and ground water ground water stored in aquifers considered a non renewable resource to renew aquifers takes hundreds of years depending on depth multiple aquifers at different depths want to draw water from aquifers that are rel deep aquifer in Bastrop prob 30m deep rst aquifer here going to be signi cantly deeper rst aquifer in the Kalahari bt 50m and 300m deep recharge zone for the aquifer is not necessarily where you extract the water all water from runoff if sent into a river will not be available for groundwater recharge surface water biggest prob is ooding in certain areas ooding is seasonal so ooding is a normal process becomes an issue when humans build too close to river systems or channelize the rivers higher the rainfall higher the ood more damage to surrounding area dams stop sediment from reaching the deltas at the end of the rivers oodplains down the river dams in asiaAfrica ashran dam on nile river prevent nutrients from reaching nile delta farming main source of income basically prevented the farmers from doing any farming at all whatsoever standing water bodies heavily increase the amount of attraction of vector born diseases like malaria increasing the risk for the naUves most standing water is used for irrigation for agriculture leads to increase in the salinity that quickly exceed phytotoxic levels
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