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Energy is the ability to do work. It can come in the forms of heat and light. There are two types of energy: working energy and stored energy. Stored energy becomes working energy when we use it. You eat food for energy. Then your body stores the energy until you need it. When you work and play, your stored energy becomes working energy. We use energy every day. We use it to grow our food, warm our homes and run machines. It's an important part of our lives. Most of the time, we use stored energy for fuel. Burning fuel sets the stored energy free in the form of heat. Long ago, people only burned wood as fuel. Now, we mostly burn "fossil fuels" - like natural gas and oil. Why are they called fossil fuels? They are called fossil fuels because they are formed over millions of years from the fossils, or remains, of dead animals and plants. The fossils became buried under dirt and rock. Heat from the earth and pressure from dirt and rock changes these fossils into natural gas, oil and coal. Because it takes millions of years to make, or "renew," fossil fuels, we call them "nonrenewable fuels." To learn more about how natural gas is formed, click here. Other fuels are called "renewable fuels" because they are "renewed" all the time and will never run out. One example of a renewable fuel is solar energy (energy from the sun). How do we use energy? We use energy to heat and cool our homes. We burn natural gas in our furnaces or boilers for heat. We also use natural gas to heat water for our baths and showers. We use electricity to power our lights, TVs and radios, refrigerators, washing machines and air conditioners. We use energy to run our cars. Most cars use a form of oil called gasoline to make them run.
Why is energy efficiency important? Many reasons. First, it's good for the environment. If we use energy wisely, there will be enough for future generations. Second when your home is energy efficient, it's more comfortable.
Heavy smog can make your eyes sting and your nose and throat feel sore. When smog causes a bad air day, there are several things you can do to protect yourself. There are also things you can do every day of the year to help improve the air we breathe. Click here to learn more about keeping the air clean.
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