What is the Concern about Greenhouse Gases and the Greenhouse
Effect?  Without its atmosphere and the greenhouse effect, the
average temperature at the surface of the Earth would be zero
degrees Fahrenheit. However, too many greenhouse gases can cause
the temperature to increase out of control. Such is the case on
Venus where greenhouse gases are abundant and the average
temperature at the surface is more than 855 degrees Fahrenheit
(457 degrees Celsius).  You might hear people talking about the
greenhouse effect as if it is a bad thing. It is not a bad
thing, but people are concerned because Earth’s ‘greenhouse’ is
warming up very rapidly. This is happening because we are
currently adding more greenhouse gases to our atmosphere,
causing an increased greenhouse effect. The increased greenhouse
effect is causing changes in our planet that can affect our
lives.  The major Greenhouse Gas, carbon dioxide, emitted
naturally and by the burning of fossil fuels, stays in the
atmosphere a long time. Its warming effect