Global Warming

Global Warming

Global Warming
Reading Level

	edHelper's suggested reading level:	high interest, readability grades 5 to 6
	Flesch-Kincaid grade level:	4.68

Vocabulary

challenging words:

happening, radiation, photosynthesis, negative, thermostat, atmosphere, greenhouse, violent, injury, naturally, conserve, coastal, shocking, dose, carbon, dioxide

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Global Warming
By Patti Hutchison

¹     You know that the sun is the source of all energy on earth. But sometimes we get a double dose of that energy. Solar radiation reaches the earth. The earth soaks up some of it and reflects some back to the atmosphere. The reflected radiation is absorbed by the gases in the atmosphere. The gases act like the glass walls of a greenhouse. They trap the warm air in and reflect it back to earth again. Scientists call this the greenhouse effect.

²     You may have heard that the greenhouse effect is a bad thing. But the truth is life could not exist on earth without it. Our planet would be cold. However, an increase in the greenhouse effect would make earth too hot. Many scientists think that this is happening now. There is an increase in carbon dioxide. This is causing an increase in the greenhouse effect. The earth is warming up.

³     Temperatures around the earth have steadily gone up over the past 200 years. The past twenty years have seen the biggest increase. If this continues, it could have a shocking effect on the earth. People's lives could be changed in a negative way.

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