Global Warming

Global WarmingBy: AF

OutlineWhat is Global Warming?CausesHow does it effect us?Slow down Global warmingConclusion

What is Global Warming?Heating of the EarthNatural and Human Influences

Causes NaturalNatural cyclesMilankovitch CycleGreenhouse effect HumansEnhanced greenhouse effect

Natural CyclesCaused by Milankovitch CyclesData has been recorded from over past 1 million yearsOne cycle is 100,000 yearsTwo parts 80-90% in one, 10-20% in the otherIce Age is 80-90,000 yearsWarming Period is 10-20,000 yearsCurrent warming is part of the natural cycleIf humans had not had the industrial revolution, we would be in the cooling period

Milankovitch CyclesOrbit of the EarthCauses ice ages and warm periodsIce ages occur every 100,000 years3 general factors determine the periodEccentricity changes in the orbit around the sunObliquity tilt of the Earths axisPrecession wobble of the Earths axis

Milankovitch Cycles Cont.Two ways the Earth can sitPerihelion tilt and wobble make the northern hemisphere closer to the sun and causes warmingAphelion tilt and wobble make the northern hemisphere farther away from the sun and causes coolingEccentricity CycleLongest cycle100,000 years longDuring the cycle, spend less time close to the sun

Milankovitch Cycles Cont.Obliquity CycleAxis stays about 23 degrees, varies 22-24 Increased obliquity causes hotter summers and cooler wintersOnly take a few thousand years for all ice to meltDecreased obliquity causes cooler summersPrecession CycleWobble is driven by tidal forces which is influenced by the moonCauses different types of seasonsHemisphere closest to sun has warm summers and cool wintersHemisphere away from sun has warm winters and cool summers

Greenhouse Effect Natural Greenhouse EffectGarden GreenhouseSun passes as light, energy is absorbed, then converted into heat, this warms the greenhouse and the glass traps the heat31% incoming radiation reflects back to space20% absorbed by the atmosphereRest is absorbed into oceans and landEarth would be 33C colder making the average temperature -18C instead of 15C

Greenhouse Effect Cont.Human Enhanced Greenhouse EffectBurning of fossil fuelsCO2, methane, nitrous oxideFrom 1990, emissions increased +20% since industrializationMore gases are being produced than can be naturally dealt withWorld increase by 1.9% annually between 2001-2025Developing countries increase 2.7% annuallyExpected to pass first world use by 2018

Greenland Glaciers85% of Greenland is covered by a massive ice sheetArea of 1,736,000 km2, thickness of 1,500 meters, volume of 2,600,000 km3If it was to all melt, it would raise sea levels by 6.4 metersDr. William Krabill used an airborne laser to survey the altitude of the ice sheet in 1993-1994 and again in 1998-199951 m3 was lost in between the two testsGreenland appeared to melting!

Effects

Six Degrees Warmer

Slow Down Global Warming

ConclusionCannot prevent Global WarmingDo our part to keep Global Warming as natural as it can be

Video Linkshttp://www.youtube.com/watch?v=ROZJmX73FF4 http://www.youtube.com/watch?v=oJAbATJCugshttp://www.youtube.com/watch?NR=1&feature=fvwp&v=P-0_gDXqYeQ http://www.youtube.com/watch?v=6rdLu7wiZOE&feature=fvwp&NR=1 http://www.youtube.com/watch?NR=1&feature=fvwp&v=skFrR3g4BRQ http://www.youtube.com/watch?v=7nRf2RTqANg&feature=endscreen&NR=1 http://www.youtube.com/watch?NR=1&feature=fvwp&v=O8qmaAMK4cM http://www.youtube.com/user/NationalGeographic?feature=watch#p/search/28/mX3pHD7NH58http://www.youtube.com/user/NationalGeographic?feature=watch#p/search/17/7lgZIR-OM48 http://www.youtube.com/watch?v=7lgZIR-OM48&lr=1&feature=watch

If you want to watch these videos, you must copy and paste the link.

Picture Citationshttp://live-the-solution.com/mindmaps/ http://byclive.blogspot.ca/2011/12/global-warming-to-save-mother-earth-or.html http://geap.wordpress.com/ http://green4u.wordpress.com/2012/04/18/finally-23-of-american-believe-global-warming/ http://climate.nasa.gov/kids/bigQuestions/greenhouseEffect/ http://www.enchantedlearning.com/subjects/astronomy/planets/earth/Greenhouse.shtml http://www.eia.gov/oiaf/1605/ggccebro/chapter1.html

Not in order of appearance

BibliographiesGlobal Warming Natural Cycle. (n.d.). In OSS. Retrieved May 13, 2012, from http://ossfoundation.us/projects/environment/global-warming/natural-cycleMilankovitch Cycles. (n.d.). In OSS. Retrieved May 13, 2012, from http://ossfoundation.us/projects/environment/global-warming/milankovitch-cyclesEarth's Fidgeting Climate. (n.d.). In NASA Science | Science News. Retrieved May 13, 2012, from http://science.nasa.gov/science-news/science-at-nasa/2000/ast20oct_1/Greenhouse Gases. (n.d.). In EIA. Retrieved May 13, 2012, from http://www.eia.gov/oiaf/1605/ggccebro/chapter1.htmlCauses of Global Warming. (n.d.). In National Geographic. Retrieved May 13, 2012, from http://environment.nationalgeographic.com/environment/global-warming/gw-causesThe Greeenhouse Effect. (n.d.). In Canada's Action on Climate Change. Retrieved May 13, 2012, from http://www.climatechange.gc.ca/default.asp?lang=En&n=1A0305D5-1Climate change 101. (n.d.). In Canada's Action on Climate Change. Retrieved May 13, 2012, from http://www.climatechange.gc.ca/default.asp?lang=En&n=65CD73F4-1