logging in or signing up GLOBAL WARMING aSGuest38282 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 895 Category: Education License: All Rights Reserved Like it (1) Dislike it (1) Added: February 16, 2010 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... By: Danya90 (7 month(s) ago) good presentation can you send it to me please?? DanyaAl-Abadla@hotmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: drvorajs (19 month(s) ago) its an very good presentation except some more details require on global warming . Saving..... Post Reply Close Saving..... Edit Comment Close By: kvsatyanarayana (26 month(s) ago) hi presentation is very useful,could you pls send me.. mail:: satya_narayana158@yahoo.com Saving..... Post Reply Close Saving..... Edit Comment Close By: sindhu281025 (27 month(s) ago) i like this ppt very much.pls send it to this id lekshmi.sindhu1991@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Slide 1: GLOBAL WARMING June 2002 Dec 2003 Arizona PL.SUBRAMANIAN HOD / ECE PRESENTED BY What is global warming? : What is global warming? What is Global Warming? : What is Global Warming? Global Warming is the theory that we as humans are increasing greenhouse gases (the think layer of gases that catches the sun’s rays and heats the earth) through industrialization causing more gases and increasing the amount of sunlight that gets caught and heats the Earth. Slide 4: Over the past few centuries, people have been burning more amounts of fuels such as wood, coal, oil, natural gas and gasoline. The gases formed by the burning, such as carbon dioxide, are building up in the atmosphere. They act like greenhouse glass. The result some experts believe is the Earth heating up and undergoing global warming. Alarmist Viewpoint : Alarmist Viewpoint The alarmist viewpoint is that global warming and pollution from CO2 emissions are adding to greenhouse gases so significantly that the Earth is warming up and will continue to warm. Why is this warming bad? : Why is this warming bad? Alarmist believe that this increase in temperature will eventually cause the melting of the ice caps. This melting could increase the oceans height by up to 2 feet in only one century! This would mean many heavily populated costal cities would flood causing millions maybe billions of dollars and damage and the potential loss of life in these cities. Other Effects from Global Warming : Other Effects from Global Warming The alarmist believe that there are also other effects to global warming such as natural disasters have been increasing, disease have been spreading more rapidly, and animals have been found migrating towards the poles due to the increase in heat. The Greenhouse Effect on Earth : The Greenhouse Effect on Earth Earth’s atmosphere is slightly warmer than what it should be due to direct solar heating because of a mild case of greenhouse effect… The ground is heated by visible and (some) infrared light from the Sun. The heated surface emits infrared light. The majority of Earth’s atmosphere (N2 and O2) are not good greenhouse gas. The small amount of greenhouse gases (H2O, CO2) traps (absorb and re-emit) the infrared radiation, increasing the temperature of the atmosphere… Click on image to start animation Slide 9: Trapped Radiation Warms Earth’s Surface The Greenhouse Effect IPCC AR4 Ch 1 Slide 10: The Greenhouse Effect traps heat inside the Earth’s atmosphere. This causes our climate increasing in temperature. This is known as Global Warming. Slide 11: 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. Example of the Greenhouse Effect The Greenhouse Problem : The Greenhouse Problem IPCC WGI AR4 Greenhouse Gases : Greenhouse Gases The primary components of Earth’s atmosphere, N2 and O2 do not have absorption in the IR wavelength range, therefore, do not have a significant role in setting the surface temperature of the planet… Greenhouse gas are efficient in absorbing IR light… The most important greenhouse gases are: H2O – Water vapor. CO2 – Carbon Dioxide CH4 – methane The most abundant greenhouse gas in Earth’s atmosphere is water vapor. Most of the greenhouse heating of Earth’s atmosphere is due to Water vapor absorption of IR radiation emitted by Earth, and then transferring the energy to the surrounding air molecule Water On Earth : Water On Earth The condition is just right! The combination of two factors: Distance to the Sun and the greenhouse effect, make it possible for water to stay on Earth. N2 and O2 are not greenhouse gas. Not much CO2 in the atmosphere. Variable amount of H2O in the atmosphere…regulated by the temperature. The result is a mild greenhouse effect…not too hot, and not too cold, just the right temperature for most of the water to stay in liquid phase, and some to stay in gas phase in the atmosphere on the surface of the Earth… Source of Water : Source of Water Mt. St Helen eruption, 2004! The terrestrial planets were built from rock . No gases or water can condense at the high temperature near the Sun. So, where did the water on Earth come from? The water on Earth (and other terrestrial worlds) most likely was brought over by the comets during the period of heavy bombardment about 4 billion years ago… These water (and other gases) were trapped in the interior, and released by volcanic activities…by Outgassing Runaway Greenhouse Effect : Runaway Greenhouse Effect If we were to move the Earth closer to the Sun, like where Venus is now, then we would suffer the runaway greenhouse effect as well, lose all the water, and become hot like Venus. Glaciers are retreating : Glaciers are retreating 1979 Today Glacier length, globally IPCC AR4 WGI Effects of Global Warming : Effects of Global Warming Increased Temperature Habitat Damage and Species Affected Changes in Water Supply Rising Sea Level Upper bound determined by behavior of ice sheets... : Upper bound determined by behavior of ice sheets... West Antarctic Ice Sheet Greenland Ice Sheet West Antarctica (WAIS) East Antarctica 5m 60m 7m ...but we lack models that can reliably project Slide 20: Arctic Sea Ice Pack is Shrinking: Partly due to greenhouse gases, partly natural NSDIC September Sea Ice Extent, 1979-2008 Portage Glacier : Portage Glacier Alaska Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org Slide 22: Predicted sea level rise could prove disastrous in some regions Courtesy J. Broadus Drought Intensity Increasing : Drought Intensity Increasing IPCC AR4 WGI Slide 24: Large changes in water for drinking, food (Year 2050) Milly et al, Nature, 438, 347-350, 2005.) Food production tends to decline, low latitudes, 1-30C What extremes of climate are likely to intensify? : What extremes of climate are likely to intensify? More heat, less cold More drought More intense precipitation and flooding Changed ecosystems, species losses Higher sea level, maybe much higher ...with implications for food, drinking water, infrastructure, disease, ecosystems and species Over long term, killer heat waves become the norm : Over long term, killer heat waves become the norm Extreme Summer 2003: About 35,000 people in Europe succumb to extreme heat... “normal” summer model of “normal” model of future IPCC AR4 WGI Ecosystems expected to shift, species disappear Up to 30% at risk of extinction, 1-30C warming : Ecosystems expected to shift, species disappear Up to 30% at risk of extinction, 1-30C warming Role of Ocean Acidification Slide 28: 6-meter sea level rise Climate Wheel of Fortune : Climate Wheel of Fortune Courtesy MIT joint program Why is global warming happening? : Why is global warming happening? Burning of Fossil Fuels : Burning of Fossil Fuels Pollution from coal, natural gas, and oil Pollution from coal, natural gas, and oil Pollution from coal, natural gas, and oil Slide 32: Global Atmospheric Concentration of CO2 Slide 33: 2007 Reductions in CO2 Per Year Gigaton Carbon Produce electricity efficiently Use electricity efficiently Vehicle efficiency Solar and Wind Power Biofuels Carbon capture and storage Billions of Metric Tons Carbon Our Goal What’s being done now to reduce our emissions? : What’s being done now to reduce our emissions? Solar Power Wind Power Fuel-Efficiency What can you do to help solve the problem? : What can you do to help solve the problem? Simple Things To Do : 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. Simple Things To Do : 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. Be Bulb Smart—Use CFLs : Be Bulb Smart—Use CFLs Incandescent Compact Fluorescent What’s the difference? 1,430 lbs. CO2 pollution avoided $30 saved Future Effects of Alarmist’s Global Warming : Future Effects of Alarmist’s Global Warming Deaths from global warming will double in just 25 years, to 300,000 people a year. Global sea levels could rise by more than 20 feet with the loss of shelf ice in Greenland and Antarctica, devastating costal areas worldwide. Heat waves will be more frequent and intense. Droughts and wildfires will occur more often. The Arctic Ocean could be ice free by 2050. More than a million species could be driven to extinction by 2050. Alarmist’s Solution : Alarmist’s Solution By doing things like using compact fluorescent bulbs, inflating your tires properly, use recycled products, drive a hybrid, and even planting more trees can help. None of these are overnight solutions but if we all work to do some of these things we can drastically help our planet. What makes a planet habitable? : Two important factors determine whether a planet is habitable… Size: Need substantial mass to maintain an atmosphere Small planets cool off faster than large ones. Without the volcanic outgasing and a hot, fluid metallic core to generate magnetic field, atmospheric gas are easily depleted. Distance to the Sun – the distance to the Sun determine the energy input to the planet: Too close too hot – water evaporates. Too far too cold – water freeze. What makes a planet habitable? CONCLUDING : CONCLUDING It looks like most of the scientists agree that the global warming observed in the last century were caused by human activity. However, as we tried to demonstrate here, the global climate is a very complicated system. We understand the basic principle of the climate system, but we still don’t understand how nature regulates Earth’s climate over the long run, nor do we have the capability to create a realistic climate model and be able to predict with any certainty the effects of human activities on our climate system. … You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.
GLOBAL WARMING aSGuest38282 Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: (To copy code, click on the text box) Embed: URL: Thumbnail: WordPress Embed Customize Embed The presentation is successfully added In Your Favorites. Views: 895 Category: Education License: All Rights Reserved Like it (1) Dislike it (1) Added: February 16, 2010 This Presentation is Public Favorites: 1 Presentation Description No description available. Comments Posting comment... By: Danya90 (7 month(s) ago) good presentation can you send it to me please?? DanyaAl-Abadla@hotmail.com Saving..... Post Reply Close Saving..... Edit Comment Close By: drvorajs (19 month(s) ago) its an very good presentation except some more details require on global warming . Saving..... Post Reply Close Saving..... Edit Comment Close By: kvsatyanarayana (26 month(s) ago) hi presentation is very useful,could you pls send me.. mail:: satya_narayana158@yahoo.com Saving..... Post Reply Close Saving..... Edit Comment Close By: sindhu281025 (27 month(s) ago) i like this ppt very much.pls send it to this id lekshmi.sindhu1991@gmail.com Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Slide 1: GLOBAL WARMING June 2002 Dec 2003 Arizona PL.SUBRAMANIAN HOD / ECE PRESENTED BY What is global warming? : What is global warming? What is Global Warming? : What is Global Warming? Global Warming is the theory that we as humans are increasing greenhouse gases (the think layer of gases that catches the sun’s rays and heats the earth) through industrialization causing more gases and increasing the amount of sunlight that gets caught and heats the Earth. Slide 4: Over the past few centuries, people have been burning more amounts of fuels such as wood, coal, oil, natural gas and gasoline. The gases formed by the burning, such as carbon dioxide, are building up in the atmosphere. They act like greenhouse glass. The result some experts believe is the Earth heating up and undergoing global warming. Alarmist Viewpoint : Alarmist Viewpoint The alarmist viewpoint is that global warming and pollution from CO2 emissions are adding to greenhouse gases so significantly that the Earth is warming up and will continue to warm. Why is this warming bad? : Why is this warming bad? Alarmist believe that this increase in temperature will eventually cause the melting of the ice caps. This melting could increase the oceans height by up to 2 feet in only one century! This would mean many heavily populated costal cities would flood causing millions maybe billions of dollars and damage and the potential loss of life in these cities. Other Effects from Global Warming : Other Effects from Global Warming The alarmist believe that there are also other effects to global warming such as natural disasters have been increasing, disease have been spreading more rapidly, and animals have been found migrating towards the poles due to the increase in heat. The Greenhouse Effect on Earth : The Greenhouse Effect on Earth Earth’s atmosphere is slightly warmer than what it should be due to direct solar heating because of a mild case of greenhouse effect… The ground is heated by visible and (some) infrared light from the Sun. The heated surface emits infrared light. The majority of Earth’s atmosphere (N2 and O2) are not good greenhouse gas. The small amount of greenhouse gases (H2O, CO2) traps (absorb and re-emit) the infrared radiation, increasing the temperature of the atmosphere… Click on image to start animation Slide 9: Trapped Radiation Warms Earth’s Surface The Greenhouse Effect IPCC AR4 Ch 1 Slide 10: The Greenhouse Effect traps heat inside the Earth’s atmosphere. This causes our climate increasing in temperature. This is known as Global Warming. Slide 11: 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. Example of the Greenhouse Effect The Greenhouse Problem : The Greenhouse Problem IPCC WGI AR4 Greenhouse Gases : Greenhouse Gases The primary components of Earth’s atmosphere, N2 and O2 do not have absorption in the IR wavelength range, therefore, do not have a significant role in setting the surface temperature of the planet… Greenhouse gas are efficient in absorbing IR light… The most important greenhouse gases are: H2O – Water vapor. CO2 – Carbon Dioxide CH4 – methane The most abundant greenhouse gas in Earth’s atmosphere is water vapor. Most of the greenhouse heating of Earth’s atmosphere is due to Water vapor absorption of IR radiation emitted by Earth, and then transferring the energy to the surrounding air molecule Water On Earth : Water On Earth The condition is just right! The combination of two factors: Distance to the Sun and the greenhouse effect, make it possible for water to stay on Earth. N2 and O2 are not greenhouse gas. Not much CO2 in the atmosphere. Variable amount of H2O in the atmosphere…regulated by the temperature. The result is a mild greenhouse effect…not too hot, and not too cold, just the right temperature for most of the water to stay in liquid phase, and some to stay in gas phase in the atmosphere on the surface of the Earth… Source of Water : Source of Water Mt. St Helen eruption, 2004! The terrestrial planets were built from rock . No gases or water can condense at the high temperature near the Sun. So, where did the water on Earth come from? The water on Earth (and other terrestrial worlds) most likely was brought over by the comets during the period of heavy bombardment about 4 billion years ago… These water (and other gases) were trapped in the interior, and released by volcanic activities…by Outgassing Runaway Greenhouse Effect : Runaway Greenhouse Effect If we were to move the Earth closer to the Sun, like where Venus is now, then we would suffer the runaway greenhouse effect as well, lose all the water, and become hot like Venus. Glaciers are retreating : Glaciers are retreating 1979 Today Glacier length, globally IPCC AR4 WGI Effects of Global Warming : Effects of Global Warming Increased Temperature Habitat Damage and Species Affected Changes in Water Supply Rising Sea Level Upper bound determined by behavior of ice sheets... : Upper bound determined by behavior of ice sheets... West Antarctic Ice Sheet Greenland Ice Sheet West Antarctica (WAIS) East Antarctica 5m 60m 7m ...but we lack models that can reliably project Slide 20: Arctic Sea Ice Pack is Shrinking: Partly due to greenhouse gases, partly natural NSDIC September Sea Ice Extent, 1979-2008 Portage Glacier : Portage Glacier Alaska Photos: NOAA Photo Collection and Gary Braasch – WorldViewOfGlobalWarming.org Slide 22: Predicted sea level rise could prove disastrous in some regions Courtesy J. Broadus Drought Intensity Increasing : Drought Intensity Increasing IPCC AR4 WGI Slide 24: Large changes in water for drinking, food (Year 2050) Milly et al, Nature, 438, 347-350, 2005.) Food production tends to decline, low latitudes, 1-30C What extremes of climate are likely to intensify? : What extremes of climate are likely to intensify? More heat, less cold More drought More intense precipitation and flooding Changed ecosystems, species losses Higher sea level, maybe much higher ...with implications for food, drinking water, infrastructure, disease, ecosystems and species Over long term, killer heat waves become the norm : Over long term, killer heat waves become the norm Extreme Summer 2003: About 35,000 people in Europe succumb to extreme heat... “normal” summer model of “normal” model of future IPCC AR4 WGI Ecosystems expected to shift, species disappear Up to 30% at risk of extinction, 1-30C warming : Ecosystems expected to shift, species disappear Up to 30% at risk of extinction, 1-30C warming Role of Ocean Acidification Slide 28: 6-meter sea level rise Climate Wheel of Fortune : Climate Wheel of Fortune Courtesy MIT joint program Why is global warming happening? : Why is global warming happening? Burning of Fossil Fuels : Burning of Fossil Fuels Pollution from coal, natural gas, and oil Pollution from coal, natural gas, and oil Pollution from coal, natural gas, and oil Slide 32: Global Atmospheric Concentration of CO2 Slide 33: 2007 Reductions in CO2 Per Year Gigaton Carbon Produce electricity efficiently Use electricity efficiently Vehicle efficiency Solar and Wind Power Biofuels Carbon capture and storage Billions of Metric Tons Carbon Our Goal What’s being done now to reduce our emissions? : What’s being done now to reduce our emissions? Solar Power Wind Power Fuel-Efficiency What can you do to help solve the problem? : What can you do to help solve the problem? Simple Things To Do : 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. Simple Things To Do : 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. Be Bulb Smart—Use CFLs : Be Bulb Smart—Use CFLs Incandescent Compact Fluorescent What’s the difference? 1,430 lbs. CO2 pollution avoided $30 saved Future Effects of Alarmist’s Global Warming : Future Effects of Alarmist’s Global Warming Deaths from global warming will double in just 25 years, to 300,000 people a year. Global sea levels could rise by more than 20 feet with the loss of shelf ice in Greenland and Antarctica, devastating costal areas worldwide. Heat waves will be more frequent and intense. Droughts and wildfires will occur more often. The Arctic Ocean could be ice free by 2050. More than a million species could be driven to extinction by 2050. Alarmist’s Solution : Alarmist’s Solution By doing things like using compact fluorescent bulbs, inflating your tires properly, use recycled products, drive a hybrid, and even planting more trees can help. None of these are overnight solutions but if we all work to do some of these things we can drastically help our planet. What makes a planet habitable? : Two important factors determine whether a planet is habitable… Size: Need substantial mass to maintain an atmosphere Small planets cool off faster than large ones. Without the volcanic outgasing and a hot, fluid metallic core to generate magnetic field, atmospheric gas are easily depleted. Distance to the Sun – the distance to the Sun determine the energy input to the planet: Too close too hot – water evaporates. Too far too cold – water freeze. What makes a planet habitable? CONCLUDING : CONCLUDING It looks like most of the scientists agree that the global warming observed in the last century were caused by human activity. However, as we tried to demonstrate here, the global climate is a very complicated system. We understand the basic principle of the climate system, but we still don’t understand how nature regulates Earth’s climate over the long run, nor do we have the capability to create a realistic climate model and be able to predict with any certainty the effects of human activities on our climate system. …