Global Warming By Libby Waranch.

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Presentation transcript:

Global Warming By Libby Waranch

What is GLOBAL WARMING? Global warming refers to an average increase in the Earth's temperature, which in turn causes change in climate. A warmer Earth may lead to changes in rain fall patterns, a rise in sea levels, and a wide range of impacts on plants, wildlife, and humans. When scientists talk about the issue of climate change, their concern is about global warming caused by human activities. Most all scientists are positive that one of the main contributing factors to global warming is the green house effect

Green House Effect and Gases The Green house effect is the rise in temperature that the earth experiences because certain gases in the atmosphere trap energy from the sun. Water Vapor Carbon Dioxide Nitrous Oxide Methane

Green House Effect Cont. Without green house gases heat would escape back in space and earth's average temperature would be about 60º F colder. Because of how they warm our world, these gases are referred to as green house gases. The Earth’s atmosphere is all around us. It is the air that we breathe. Greenhouse gases in the atmosphere behave much like the glass panes in a greenhouse. Sunlight enters the Earth's atmosphere, passing through the blanket of greenhouse gases. As it reaches the Earth's surface, land, water, and bioshpere absorb the sunlight’s energy. Once absorbed, this energy is sent back into the atmosphere. Some of the energy passes back into space, but much of it remains trapped in the atmosphere by the greenhouse gases, causing our world to heat up. The greenhouse effect is important. Without the greenhouse effect, the Earth would not be warm enough for humans to live. But if the greenhouse effect becomes stronger, it could make the Earth warmer than usual. Even a little extra warming may cause problems for humans, plants, and animals. Cool Website to check out: http://epa.gov/climatechange/kids/global_warming_version2.html

How do we know this is affecting Earth? Climate IS the answer! Climate patterns have been changing rapidly. Climate describes the total of all weather occurring over a period of years in a given place. This includes average weather conditions, regular weather sequences (like winter, spring, summer, and fall), and special weather events (like tornadoes and floods). Climate tells us what it's usually like in the place where you live. It may seem hard to believe that people can actually change the Earth’s climate the things people do that send green house gases into the air are making our planet warmer.

More Heat? Our atmosphere is not the only thing in our universe that holds heat here on hear, so do our oceans.

Oceans Oceans cover about 70 percent of Earth's surface. Their large mass and thermal properties enable them to store vast quantities of heat. Oceans buffer and regulate temperature – energy absorbed or lost by the oceans results in a smaller surface temperature change than would occur over land. The atmosphere and ocean constantly exchange energy and matter. For example, water evaporates from the oceans into the atmosphere. This moisture then falls back to the Earth as precipitation – rain, snow, sleet, and even the morning dew on the grass.

What is ATMOSHPERE? The atmosphere covers the Earth. It is a thin layer of mixed gases which make up the air we breathe. This thin layer also helps the Earth from becoming too hot or too cold, much like clothing does for us. Wheather systems, which develop in the lower atmosphere, are driven by heat from the sun, the rotation of the Earth, and variations in the Earth's surface.

The Water Cycle It is important to remember thought that global warming doesn’t change the way the water cycle works, but it does change some parts of it. Now lets remember a couple of things about the water cycle; first off: where is water stored on earth? Liquid in oceans. Liquid in rivers. Liquids in lakes Underground. In between rocks and soil. Frozen in glaciers Frozen in snow Found as vapor in clouds that come down as rain.

How are they related? Global warming enhances the water cycle because the cycle of water becomes intensified and more extreme. By extreme I mean that since the atmosphere is warmer it can evaporate more water and hold onto more vapors. Since the atmosphere can hold on to the vapors there is flooding that occurs in areas that are close to large bodies of water and there is drought in areas far away from large bodies of water. These kind of dramatic climate changes cause disruption to the plants, animals and humans in the area. http://www.dnr.state.wi.us/org/caer/ce/eek/earth/groundwater/images/groundwater.gif

Biosphere and Global Warming? The biosphere is that part of Earth's atmosphere, land, oceans that supports any living plant, animal, or organism. It is the place where plants and animals, including humans, live. Large quantities of carbon dioxide are exchanged between the land-based biosphere and the atmosphere as plants take in carbon dioxide and give off oxygen, and animals inhale oxygen and exhale carbon dioxide. Check out this cool site about how the planets carbon cycle affects global warming: http://epa.gov/climatechange/kids/carbon_cycle_version2.html

Affects of Global Warming Melting Glaciers: scientists think the glaciers are melting partly because the Earth is getting warmer. Rising Sea Levels: Over the last 100 years, the level of the sea has risen about 6-8 inches worldwide. When the sea level rises, the tide goes farther up the beach. *Scientists think the sea has risen partly because of melting glaciers and sea ice. When some glaciers melt, they release water into the sea and make it higher than it was before. Scientists also think that warmer temperatures in the sea make it rise even more. Heat makes water expand. When the ocean expands, it takes up more space

Affects on Us and our Environment Caused by Global Warming Human Health: Climate change may affect people's health both directly and indirectly. Directly: Scientists suspect that, in many places, climate change will increase the number of very hot days that occur during the year. More hot days increases the possibility of heat related health problems Indirectly: ecological disturbances, air pollution, changes in food and water supplies, and coastal flooding are all examples of possible impacts that might affect human health. Ecological Systems: Climate change may alter the world's habitats and ecosystems – all living things are included in and rely on these places. Many of these places depend on a delicate balance of rainfall, temperature, and soil type. A rapid change in climate could upset this balance and seriously endanger many living things. Seal Level Rise: Sea level may rise between several inches and as much as 3 feet during the next century. This will effect both natural systems and manmade structures along coastlines. Coastal flooding could cause saltwater to flow into areas where salt is harmful, threatening plants and animals in those areas Crops and Food Supply: Global warming may make the Earth warmer in cold places. People living in these places may have a chance to grow crops in new areas. But climate change also might bring droughts to other places where we grow crops. In some parts of the world, people may not have enough to eat because they cannot grow the food that they need.

Humans Contribute to Global Warming We send greenhouse gases into the Air by… Watching TV Use the Air Conditioner Turn on a light Use a hair dryer Ride in a car Play video games Listen to the stereo Wash and Dry Cloths Use a dishwasher Microwave a meal To perform many of these functions, you need to use electricity. Electricity comes from power plants. Most power plants use coal and oil to make electricity. Burning coal and oil produces greenhouse gases

Other things that produce Greenhouse Gases… Landfills Cows Coal mining Riding in a car Factories http://epa.gov/climatechange/kids/change.html

WE CAN HELP!!! Read Learning about the environment is very important. There are many good books that will help you learn. Save Electricity Whenever we use electricity, we help put greenhouse gases into the air. By turning off lights, the television, and the computer when you are through with them, you can help a lot. Bike, Bus, and Walk You can save energy by sometimes taking the bus, riding a bike, or walking.

More Ways YOU can help! Plant Trees Planting trees is fun and a great way to reduce greenhouse gases. Trees absorb carbon dioxide, a greenhouse gas, from the air. Recycle Recycle cans, bottles, plastic bags, and newspapers. When you recycle, you send less trash to the landfill and you help save natural resources, like trees, oil, and elements such as aluminum. Use Recycled Products: Did you know that you can help the environment if you buy recyclable products instead of non-recyclable ones? Look for the recycle mark – three arrows that make a circle – on the package. Recyclable products are usually made out of things that already have been used. It usually takes less energy to make recycled products than to make new ones. The less energy we use, the better

And the Finale Talk to Your Family and Friends! Talk with your family and friends about climate change/Global Warming. Let them know what you've learned.

Activity Time I would like everyone to get out a piece of paper and think about what we have just learned today. Think about ways that you can “Talk to your family” about how to slow down Global Warming. Write your parents a letter telling them what changes you believe that you and the rest of the family can do to make a difference on the effects of Global Warming on Earth. Have fun with it!