Global Warming. By William K. Tong. Environmental Scientist U.S. EPA Region 5. Water Enforcement & Compliance Assurance Branch

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1 Global Warming By William K. Tong Environmental Scientist U.S. EPA Region 5 Water Enforcement & Compliance Assurance Branch

2 What Is Global Warming? According to the National Academy of Sciences, the Earth's surface temperature has risen by about 1 degree Fahrenheit during the past century, with accelerated warming during the past two decades. There is new and stronger evidence that most of the warming over the last 50 years is attributable to human activities, primarily the burning of fossil fuels. Human activities have altered the chemical composition of the atmosphere through the buildup of greenhouse gases primarily carbon dioxide, methane, and nitrous oxide. The heat-trapping property of these gases is undisputed, although uncertainties exist about exactly how earth s climate responds to them.

3 Our Changing Atmosphere Energy from the sun drives the earth s weather and climate, and heats the earth s surface; in turn, the earth radiates energy back into space. Atmospheric greenhouse gases (water vapor, carbon dioxide, and other gases) trap some of the outgoing energy, retaining heat somewhat like the glass panels of a greenhouse. Without this natural greenhouse effect, temperatures would be much lower than they are now, and life as known today would not be possible. Instead, thanks to greenhouse gases, the earth s average temperature is a more hospitable 60 F. However, problems may arise when the atmospheric concentration of greenhouse gases increases.

4

5 Global Temperature Increase

6 What Are Greenhouse Gases? Some greenhouse gases occur naturally in the atmosphere, while others result from human activities. Naturally occuring greenhouse gases include: water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Certain human activities, however, add to the levels of most of these naturally occurring gases: Carbon dioxide is released to the atmosphere when solid waste, fossil fuels (oil, natural gas, and coal), and wood and wood products are burned. Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from the decomposition of organic wastes in municipal solid waste landfills, and the raising of livestock. Nitrous oxide is emitted during agricultural and industrial activities, as well as during combustion of solid waste and fossil fuels.

7 The Ozone Hole Ozone is made of 3 oxygen atoms (O 3 ) bonded together per molecule, but behaves very different than normal oxygen (O 2 ), and is a lung irritant. Ozone benefits us in the upper atmosphere, where it acts as a shield against the sun s ultraviolet rays. Ozone is what made life possible on land. However, decades of air pollution have released chlorine and fluorine gas from decomposed refrigerant compounds such as Freon, and have created a large ozone hole. The ozone hole is blamed increases in skin cancer due to increased exposure to solar ultraviolet radiation The EPA banned the production of Freon in 1977.

8 Increase In Greenhouse Gases Since the beginning of the industrial revolution, atmospheric concentrations of atmospheric greenhouse (solar heattrapping) gases have increased: carbon dioxide, up nearly 30% methane, up over 100%, nitrous oxide, up by about 15% Why are greenhouse gas concentrations increasing? Scientists generally believe that the combustion of fossil fuels and other human activities are the primary reason for the increased concentration of carbon dioxide.

9 Human Activities Have Increased Atmospheric Carbon Dioxide What has changed in the last few hundred years is the additional release of carbon dioxide by human activities. Fossil fuels burned to run cars and trucks, heat homes and businesses, and power factories are responsible for about: 98% of U.S. carbon dioxide emissions 24% of methane emissions, 18% of nitrous oxide emissions Increased agriculture, deforestation, landfills, industrial production, and mining also contribute a significant share of emissions. In 1997, the United States emitted about one-fifth of total global greenhouse gases. By 2100, unless emissions are controlled, carbon dioxide concentrations are projected to be 30 to 150% higher than today s levels.

10 Evidence of Changing Climate Global average surface temperatures have increased 0.5 to1.0 F since the late 1800 s. The 20th century's 10 warmest years all occurred during ; of these, 1998 was the warmest year on record. The snow cover in the Northern Hemisphere and floating ice in the Arctic Ocean have decreased. Globally, sea level has risen 4-8 inches over the past century. Worldwide precipitation over land has increased by about1%. The frequency of extreme rainfall events has increased throughout much of the United States. The global increase in surface temperatures of tropical ocean water above 80 F is suspected as a cause for unusually violent hurricanes (Katrina and Rita during 2005)

11 Effects of Changing Climate Increasing concentrations of greenhouse gases are likely to accelerate the rate of climate change. Scientists expect that the average global surface temperature could rise F during the next 50 years, and 2.2 to10 F within the next 100 years, with significant regional variation. Rising global temperatures are expected to raise sea level, and change precipitation and other local climate conditions. Changing regional climate could alter forests, crop yields, and water supplies. It could also affect human health, animals, and many types of ecosystems. Deserts may expand into existing rangelands, and features of some of our National Parks may be permanently altered. Evaporation will increase as the climate warms, which will increase average global precipitation. Soil moisture is likely to decline in many regions, and intense rainstorms are likely to become more frequent. Sea level is likely to rise 2 feet along most of the U.S. coast. Calculations of climate change for specific areas are much less reliable than global ones, and it is unclear whether regional climate will become more variable.

12 Quiz! Question 1: Where is global warming expected to have the largest impact? High latitudes like the Arctic Mid latitudes like the Great Plains Low latitudes like the Southwest

13 Answer to Question 1 1. High latitudes like the Arctic

14 Question 2: Changes in climate have caused glacier retreat in which of the following locations? 1. Ecuador 2. Greenland 3. Montana 4. All of the above

15 Answer to Question 2 4. All of the above

16 Question 3: How far to the north do scientists think that global warming may shift the ideal range of North American forests? miles miles miles miles

17 Answer to Question miles

18 Question 4: If warming forces trees to migrate, what kind of trees will have the best chance of survival? 1. Tall trees with thick trunks 2. Trees whose seeds are carried by the wind 3. Nut-bearing trees 4. Trees whose seeds are spread by birds

19 Answer to Question 4 4. Trees whose seeds are spread by birds

20 Question 5: What species are most likely to benefit directly from increasing levels of carbon dioxide? 1. Ducks 2. Trees 3. Fish

21 Answer to Question 5 2. Trees

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