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Global Warming What Is It?.

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Presentation on theme: "Global Warming What Is It?."— Presentation transcript:

1 Global Warming What Is It?

2 Earth has Warmed by about 1 degree Farenheit over The past 100 years.
Global warming is the gradual increase of the temperature of the earth, which in turn causes changes in climate. Earth has Warmed by about 1 degree Farenheit over The past 100 years.

3 What is Climate? It is the long-term average (usually 30 years) of a particular region’s weather pattern. At the peak of the last ice age (18,000 years ago), The temperature was only 7 degrees colder than it is today, and glaciers covered much of North America!

4 So You See… Even a small increase in temperature over a long time can change the climate. When the climate changes, there may be big changes in things that people depend on. These things include the level of the oceans and the places where we plant crops. They also include the air we breathe and the water we drink.

5 What Might Happen to Human Health?
Global warming may cause an increase in heat stress and other heat related health problems. Ecological disturbances, air pollution, changes in food and water supplies, and coastal flooding may also affect human health. Poor people, poor countries, very young children, and the elderly will run the highest risks without the money and resources needed to cope.

6 How will it Effect Our Ecosystems?
If future climate changes occur as rapidly as predicted, an upset in the delicate balance of rainfall, temperature, and soil type could seriously endanger many plants and animals and their habitats.

7 What About our Sea Level?
Global warming may make the sea level become higher. Warmer weather makes the glaciers melt and adds more water to the ocean. Warm temperatures also make water expand. This takes up more space and the level of the sea rises. It could rise as much as 3 feet during the next century! What problems could this cause?

8 Coastal flooding could cause saltwater to flow into areas where salt is harmful, threatening plants and animals in those areas. Flooding and beach erosion could affect oceanfront property and reduce the quality of drinking water.

9 What about our Crops and Food Supply?
Global warming may make the Earth warmer in cold places, giving people in those places a chance to grow crops in new areas. BUT… It may also bring droughts to many parts of the world. This would leave people without enough to eat because they couldn’t grow the food that they need.

10 What is the Greenhouse Effect?

11 The greenhouse effect is what causes global warming.
It is called “greenhouse effect” because it is the same process that keeps the air inside greenhouses (and parked cars) warmer than the air outside.

12 The glass in greenhouse windows is transparent to visible light radiated from the sun.
This light heats the surface of materials inside the greenhouse, which emit longer wave-length infrared radiation.

13 Infrared radiation cannot penetrate the glass and is trapped…
Causing the inside air to warm up.

14 These are called “greenhouse gasses”.
Water vapor, clouds, carbon dioxide, & other gasses in our atmosphere act like the greenhouse glass by preventing some of the infrared radiation emitted by the earth to escape into space. These are called “greenhouse gasses”.

15 Where Do Greenhouse Gasses Come From?

16 Volcanoes Forest fires, crop burning, and clearing of rain forests Automobiles and other internal-combustion engines CFCs used in refrigerators, air conditioners and aerosol spray cans.

17 Because the levels of these gasses are increasing, more and more of the heat radiated by the earth’s surface is trapped in the atmosphere… …causing our world to heat up.

18 The Greenhouse Effect Some of the infrared radiation Some solar
passes through the atmosphere, and some is absorbed and re- emitted in all directions by Greenhouse gas molecules. The effect of this is to warm the earth’s surface and the lower atmosphere. Some solar radiation is reflected by the earth and the atmosphere. Solar radiation passes through the clear atmosphere. Most radiation is absorbed by the earth’s surface and warms it.

19 Extra warming may cause
The greenhouse effect is important. Without it, the Earth would not be warm enough for humans to live. But, if it becomes Stronger, it could make The Earth warmer than Usual. Even a little Extra warming may cause Problems for humans, Plants, and animals.


21 If we try, most of us can do our part to reduce the
Global warming may be a big problem, but there are many little things we can do to make a difference. If we try, most of us can do our part to reduce the amount of greenhouse gasses that we put into the atmosphere. Many greenhouse gasses come from things we do every day.

22 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.

23 BIKE BUS WALK You can save energy by sometimes taking
the bus, riding a bike, or waking.

24 Plant Trees It’s fun and a great way to reduce greenhouse gases.
Trees absorb Carbon dioxide from the air.

25 Cans, bottles, plastic bags, and newspapers.
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.

26 Fortunately, there are some cars that are better for the environment…
Cars are an important part of life for most people. But they also cause pollution and release a lot of greenhouse gases into the air. Fortunately, there are some cars that are better for the environment…

27 These cars can travel longer on a smaller amount of gasoline
These cars can travel longer on a smaller amount of gasoline. They don’t pollute as much, either. Using these kinds of cars can help reduce the amount of greenhouse gases in the air.

28 Solar energy is energy that comes from the sun.
It can be used to heat homes, buildings, water, and to make electricity. Today, more than 200,000 houses in the U.S. use this type of energy.


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