People who grow flowers year-round often use a special building that has walls and a roof made of glass. The transparent glass allows insolation to enter but prevents heat loss by radiation. So when the insolation enters the green house, the sun’s energy is trapped and warms the house. This keeps the greenhouse warmer than its surrounds.
Carbon dioxide and water vapor are like the glass in a greenhouse. They allow insolation to reach Earth’s surface, but they cut down on the escape of energy. This is known as the greenhouse effect. Without the greenhouse effect, too much energy would escape from Earth, making it too cold to sustain life. However, some scientists fear that carbon dioxide added to the atmosphere by the burning of fossil fuels could upset the energy balance of Earth by trapping more heat. This would warm Earth more than natural warming would. Furthermore, forests are being cut down at an alarming rate. Trees and other plants are important because they absorb carbon dioxide from... [continues]
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