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the term “Greenhouse effect” and includes graphical information on the
average temperature of the
Earth’s atmosphere and the carbon dioxide emission on the Earth over time.
55. The area of application is Environment Quality within a global setting.
SCIENCE EXAMPLE 1: GREENHOUSE
Read the texts and answer the questions that follow.
THE GREENHOUSE EFFECT: FACT OR FICTION?
Living things need energy to survive. The energy that sustains life
on the Earth comes from the
Sun, which radiates energy into space because it is so hot. A tiny proportion
of this energy reaches
the Earth.
The Earth’s atmosphere acts like a protective blanket over the surface of our planet, preventing the
variations in temperature that would exist in an airless world.
Most of the radiated energy coming from the Sun passes th
rough the Earth’s atmosphere. The
Earth
absorbs some of this energy, and some is reflected back from the Earth’s surface. Part of
this reflected energy is absorbed by the atmosphere.
As a result of this the average temperature above the Earth’s surface is higher than it would be if
there were no atmosphere. The Earth’s atmosphere has the same effect as a greenhouse, hence
the term greenhouse effect.
The greenhouse effect is said to have become more pronounced during the twentieth century.
It is a fact that the average temperature of the Earth’s atmosphere has increased. In newspapers
and periodicals the increased carbon dioxide emission is often stated as the main source of the
temperature rise in the twentieth century.
A student named And
ré becomes interested in the possible relationship
between the average
temperature of the Earth’s atmosphere and the carbon dioxide emission on the Earth.
In a library he comes across the following two graphs.
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André concludes from these two graphs that it is certain that the increase in the average
temperature of the Earth’s atmosphere is due to the increase in the carbon dioxide emission.
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