... of the eye), and reduced yields of some food crops. Humans are bringing about another global-scale change in the atmosphere: the increase in what are called greenhouse gases. Like glass in a greenhouse, these gases admit the sun's light but tend to reflect back downward the heat that is radiated from the ground below, trapping heat in the earth's atmosphere. This ... of the eye), and reduced yields of some food crops. Humans are bringing about another global-scale change in the atmosphere: the increase in what are called greenhouse gases. Like glass in a greenhouse, these gases admit th...

• Word Count: 6167
• Approx Pages: 25
• Has Bibliography
• Grade Level: Undergraduate

... in shallow ditches or tanks with two slanted transparent plates placed on top of the roof of a house. Solar energy heats the water and evaporates it. Transparent plates, made of glass or plastic, collect and turn the water vapor into liquid water as the vapor condenses. The ducts along the sides of the unit then collect the fresh water to a main ... ...

• Word Count: 3357
• Approx Pages: 13
• Grade Level: High School

... are also adding small particles and droplets called aerosols that reflect light back into space and tend to cause some areas to cool. It is because they trap heat like glass in a greenhouse that these gases received their name -- the greenhouse gases. They are vitally important for life. Earth has a natural greenhouse effect due to the presence of CO2 and water ... ...

• Word Count: 2775
• Approx Pages: 11
• Grade Level: Undergraduate