Some people think that global warming is caused by trees
getting cut down. Others think it is the greenhouse effect. One may think aliens
lie behind global warming.
Electrical pollution is caused by refrigerators, computers, Television sets, you
name it. Anything that uses batteries may cause global warming, too.
Most scientists believe that human actions do NOT cause global warming.
However, there is a 17% who think global warming is caused
by human actions.
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greenhouse effect is the rise in temperature that the Earth
experiences because certain gases in the
atmosphere (water vapor,
nitrous oxide, and
methane, for example) trap energy from the sun.