Lecture #3_Causes of Climate Change.pdf - Week #3: Causes...

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Week #3: Causes of Climate Change
GEOG1003WeekDateCourseworkTopicsLectures101-SepIntroductionIntroduction to global environmental issues208-Sep#1 released(Due 22-Sep)Climate ChangeIntroduction to climate change315-SepClimate ChangeCauses of climate change422-SepClimate ChangeClimates of the past529-SepClimate ChangeGlobal atmospheric change606-OctProgress Report(Due 20-Oct)Climate ChangeConsequences of climate change713-OctNO CLASS! Reading Week820-Oct#2 released(Due 3-Nov)Water resources crisisWater resources and pollution927-OctOverpopulationOverpopulation and urbanization1003-NovAir/land pollutionAir pollution, acid deposition, land pollution1110-NovNatural hazardsEarthquake, Tsunami, Thunderstorm andTornado1217-NovEnergy crisisEnergy sources and crisis1324-NovFinal Project(Due 3-Dec)Course reviewCourse review1401-DecNO CLASS! Revision Period
Weathervs.ClimateWeatherrefers to the state of the atmosphere at agiven time and place. It is constantly changing,sometimes from hour to hour and other times fromday to day.Climateis the average of daily weather parametersover many years (typically >30yrs) and characterizesseasons as well as geography.Climate=What you expectWeather =What you getClimatology, ClimatologistMeteorology, MeteorologistClimate tells what clothes toBUY, butweather tells you what clothes toWEAR.
Global Warmingvs.Climate ChangeClimate changerefers to a broad range of global phenomena causedpredominantly by burning fossil fuels, which add heat-trappinggases to Earth’s atmosphere. These phenomena includetemperature increase described by global warming, and encompassother changes such as sea level rise, snow/ice melting, moredrought/flood and extreme weather.Global warmingrefers only to the Earth’s rising surfacetemperature, whileclimate change includes warming and the “sideeffects” ofwarming.“Climate change” and “global warming” areoften usedinterchangeablybut havedistinct meanings.
Forcings of Climate ChangeAre they causing global warming?
Variations of the Earth’s surface temperaturefor the past 1,000 yearsApprox. climaterange over the 900years up to 1900Last centuryappearsunusualBut the climate variations before the industrial revolutionwere almost certainly naturalwhat caused them?And could 20thcentury warming also be a natural variation?

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Term
Spring
Professor
N/A
Tags
Global Warming, Greenhouse gas

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