What are the causes andevidence for climate change?
Green house gases• Carbon Dioxide, Methane, Nitrous Oxide• These 3 gases act as an insulating blanket andprevent heat waves reflecting back out of ouratmosphere.• Short wave energy travels from the sun.• Long wave energy travels from the earth.
Keeling CurveThe Keeling curve shows the rise of carbon dioxide in the atmosphere sincemonitoring began in 1958. Discuss the trend of the Keeling Curve.
• Interglacial is a warm period of time.• Glacial is a cold period of time.• We are living in an interglacial.• Graphs are used to display data records.Periods of Time
Carbon Dioxideconcentrationsreached amaximum of 300ppm in thewarmest periodsCarbon Dioxideconcentrationswere at about280 ppm in1950Broad dips intemperaturerepresentglacialperiodsNarrow peaks inthe temperaturerecord representshort warmepisodes(interglacials)Carbon Dioxideconcentrationsdropped to 180ppm during thecoldest periodsabcde
What evidence do we have forclimate change?What questions can we ask about this picture?
Weather is our day to dayexperience of temperature, wind,rainfall and sunshine.Climate is about taking weatherreadings over long periods oftime, and then working outaverages.
This is an example of a climate graph.The red line shows the temperatureand the blue line shows the rainfall.
Evidence for climate changeThere is lots of EVIDENCE to show Climate change istaking place. Ice CORES can be used to look at pastclimates. By studying past climates we can unlock cluesto future climates. The study of weather and CLIMATEshows clues of global warming. Sea LEVEL change canalso be used to measure how much ice has MELTED.The melting of ice will affect animal’s habitats. If icemelts more POLAR bears will die. Animals showwarnings and SIGNS of climate change. Animals have tomove their families to safer places to LIVE.
Power Plants: IcelandThe Arctic is one region where climate change is predicted tohave a huge impact. Icelands landscape will certainly change asits ice caps and glaciers melt.However, in the short term the economy could benefit asmelting glaciers feed Icelands rivers and these provide hydro-electric power (HEP) for Icelands industry. Run-off fromglaciers will peak sometime in the next 30 years and accordingto computer models, Icelands glaciers will have disappeared by2200.
Short-term changes Long-term changesPositive Views •Cheaper HEP • Warmer climate to growmore cropsNegative Views • loss of glaciers and iceretreats• more extreme weather• decrease in tourism dueto loss of glaciers
AmericaHurricane KatrinaUKThames BarrierBangladesh Mali• category 5hurricane in NewOrleans•Huge devastationin area – death /loss of business/destruction ofproperty / fires/disease•Leeves destroyed =flooding of city• Barrier to stopstorm surges fromNorth Sea up theRiver Thames•Needs to bedeveloped in futureas used more oftenthan expected•Flat low lying poorcountry•Suffers effects ofTropical Cyclones•Low technologywarning systems =man on bike with abell!!•Western Sahara•Temperaturesrapidly rising•Lake Chad isevaporating•Spread of desert =desertification•Lack of water forpeople to live•Spread of disease =mosquitos
1) Use Bio fuels2) Create Carbon Sinks = afforestation3) Create Sustainable Communities4) Be more energy efficient5) More effective City Planning
1) Use Brownfield Sites not Green field2) Develop local facilities to reduce travel3) Develop Green Technology4) Create local Jobs5) Use Solar Furnaces – e.g. Seville in Spain, provides energy for 6, 00homes from Solar energy plant