The greenhouse effect is neither new nor necessarily bad. In fact
Like a blanket, these minute concentrations of greenhouse gases trap the radiated ... greenhouse, allowing sunlight to pass through but trapping some of the ...
The greenhouse effect is neither new nor necessarily bad. In fact, without the greenhouse effect, life as we know it would probably not exist on the earth. The greenhouse effect is the warming of the earth's surface from heat trapped in the atmosphere. For at least 4.6 billion years, solar energy released by the sun's nuclear furnace has penetrated the earth's atmosphere. About half of the solar energy reaching the earth's surface is reflected back into space or absorbed in the upper atmosphere. The other half is absorbed by the earth's land and water masses. As the earth absorbs solar radiation, it is heated and emits a less intense form of energy but at longer wavelengths. Much of this energy passes unimpeded through the atmosphere. The dominant gases in the atmosphere -- nitrogen (77%) and oxygen (21%) -- have no effect on the radiated energy. But some trace gases in the atmosphere, like water vapor (1%) and carbon dioxide (0.03%), behave differently. They absorb the longer-wavelength energy or reflect it back to the surface. Like a blanket, these minute concentrations of greenhouse gases trap the radiated energy, converting it to heat. These trace gases in the atmosphere create roughly the same effect as the glass panes of a greenhouse, allowing sunlight to pass through but trapping some of the radiated heat. This accounts for the name "greenhouse effect." Without the natural phenomena of the greenhouse effect, the earth would be about 60 degrees F cooler (or 33-35 degrees C) than it is today, an icy, uninhabitable planet. Yet, today's concern is that human activity may be tipping the earth's delicate environmental balance by significantly increasing the buildup of greenhouse gases in the atmosphere and enhancing their insulating effect. 2000 National Energy Technology Laboratory U.S. Department of Energy
Answer the following questions. 1. What does the text deal with ?
..................................................................................................................................................... ..................................................................................................................................................... 2. What is the greenhouse effect ? Explain it.
3. How long has the solar energy penetrated the earth's atmosphere ?
..................................................................................................................................................... ..................................................................................................................................................... 4. what happens to the solar energy ?
..................................................................................................................................................... ..................................................................................................................................................... 5. What does the earth absorb ?
..................................................................................................................................................... ..................................................................................................................................................... 6. Where does the enrgy pass ?
..................................................................................................................................................... ..................................................................................................................................................... 7. Name two important gases in the atmosphere.
..................................................................................................................................................... ..................................................................................................................................................... 8. How do water vapor and carbon dioxyde behave ? (react)
..................................................................................................................................................... ..................................................................................................................................................... 9. Why is the greenhouse effect quite essential and negative on the other hand ?
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