What is global warming? Definition of Global Warming • Gradual ( which means a little bit over a period of time) change in the Earth’s Temperature Is it a Bad Thing? • Yes and No. • We actually need a little bit of global warming to keep the earth warm. Without it the earth would be a frozen ball. Too Much of a Good Thing • The bad part about it is we have too much of a good thing going and the earth is getting hotter. • Sort of like eating that one last piece of candy after eating like twenty which makes you want to throw up What about the Greenhouse Effect? This is So Confusing • Many people refer to the word greenhouse effect and global warming as the same thing. Thinking about a Greenhouse will Actually Help Us Here A Greenhouse… • Stays warm all year even in winter. • This allows farmer’s to grow vegetables all year round • http://science.howstuffworks.com/eden2.ht m Still Confused? • Imagine the Earth being like a car sitting out in a parking lot on a hot day. • If the car has been sitting awhile in the sun, the inside of the car is always much hotter than the outside. • The sun’s rays enter the car and not all of the sun’s rays escape through the closed windows. Example of the Greenhouse Effect The Sun’s energy passes through the car’s windshield. This energy (heat) is trapped inside the car and cannot pass back through the windshield, causing the inside of the car to warm up. Earth’s Greenhouse Effect • When the sun’s rays hit the earth, 70 percent of it gets absorbed by land, oceans, etc. ( Some of it eventually gets released back to the atmosphere) • Global warming is caused by an increase in the greenhouse effect. Why is global warming happening? Burning of Fossil Fuels Pollution from coal, natural gas, and oil • Through human activity ( scientists now really believe this) we are releasing a great deal of energy into the atmosphere which is covering the earth like a ton of warm blankets. • Not enough of this energy is escaping into space. CO2: Carbon Dioxide • Probably the most important of the greenhouse gases • Stays in the atmosphere for about 100 years • We used to have a balance because plants take in carbon dioxide and make it oxygen. TIMBER…….. • Deforestation – Destruction of forests mostly to develop land. Burning Fossil Fuels • Burning Fossil Fuels ( to drive cars, run factories, heat homes) has releases carbon dioxide. Hold Your Breath! • When you breathe…you also release carbon dioxide. • The population problem has caused an increase in CO2 Methane • We find this naturally when bacteria breaks down organic matter. • Plants , Animals and YOU produce Methane. Nitrous Oxide is NO Laughing Matter! • Lasts up to 150 years • Burning Fossil Fuels OZONE ( NOT TO BE CONFUSED WITH THE OZONE LAYER) • Ground level ozone ( given off by buses and some cars) is an air pollutant and also a greenhouse gas. Water Vapor • We should think twice about letting our future cars run on water. This may be causing more of a problem. How Global Warming Works Carbon Dioxide (CO2) Fossil fuels (coal, oil, natural gas) What’s the difference between “global warming” and “climate change”? Difference GLOBAL WARMING CLIMATE CHANGE is the increase of the is a broader term that Earth’s average refers to long-term surface temperature changes in climate, due to a build-up of including average greenhouse gases in temperature and the atmosphere. precipitation. Effects of Global Warming Rising Sea Level Increased Temperature Habitat Damage and Species Affected Changes in Water Supply The Golden Toad Extinction of the Golden Toad • The result of an increase in global temperature the golden toad is now believed to be extinct. • The increase in temperature caused skin funguses to grow and kill off this animal Polar Bears on Thin Ice Did it Cause Hurricane Katrina? • Some scientists believe that weather patterns are becoming more deadly as a result of oceans getting warmer. What’s the proof that global warming is taking place? Portage Glacier • Alaska 1914 2004 Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org Colorado River • Arizona June 2002 Dec 2003 When did global warming start? Global Atmospheric Concentration of CO2 How is global warming measured? Ice Core Data CO2 Measurements Before 1958 - Antarctica CO2 Atmospheric Measurements CO2 Measurements Since 1958 – Mauna Loa, Hawaii 1000 Years of CO2 and Global Warming Temperature (Northern Hemisphere) CO2 Concentrations Degree Celsius Increase Parts Per Million 1000 1200 1400 1600 1800 2000 1000 1200 1400 1600 1800 2000 Year Year Global Warming: Shifting Gears Billions of Metric Tons Carbon Goal: Reductions in 2007 CO2 Per Year Billions of Metric Tons Carbon Our Goal Produce electricity efficiently Use electricity efficiently Vehicle efficiency Gigaton Carbon Solar and Wind Power Biofuels Carbon capture Reductions and storage 2007 in CO2 Per Year What’s being done now to reduce our emissions? Wind Power Solar Power Fuel-Efficiency What can you do to help solve the problem? Simple Things To Do Turn off your computer or the TV when you’re not using it. Take shorter showers. Heating water uses energy. Keep rooms cool by closing the blinds, shades, or curtains. Turn off the lights when you leave a room. Use compact fluorescent bulbs. Be Bulb Smart—Use CFLs What’s the Compact Incandescent difference? Fluorescent 500 lbs. of coal •1,430 lbs. CO2 pollution avoided •$30 saved Simple Things To Do Dress lightly when it’s hot instead of turning up the air conditioning. Or use a fan. Dress warmly when it’s cold instead of turning up the heat. Offer to help your parents keep the air filters on your AC and furnace clean. Walk short distances instead of asking for a ride in the car. Plant a tree. Recycle.
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