Travel and Tourism English Toolkit 1 - Natural Sciences Activities What do these photos show?. In a greenhouse, light energy penetrates through the glass and falls upon the plants inside
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English Toolkit 1 - Natural Sciences
Activities
What do these photos show? Which of them may happen naturally and
which can be caused by man? Are any of them common in
your country? In other parts of the world?
In a greenhouse, light energy penetrates through
the glass and falls upon the plants inside When it
hits a surface, light energy becomes heat energy,
and escapes into the atmosphere In the same way,
the Earth is warmed by the sun and cools off by
radiating heat energy (infrared radiation) back up
towards space These heated gases then radiate
part of the energy back down towards the Earth
This process, called greenhouse effect, absorbs
most of the harmful radiation before it reaches
the Earth’s surface Measurements indicate an
increase in the levels of greenhouse gases (carbon
dioxide, methane, nitrous oxide, water vapour and
The Greenhouse Effect
chlorofluorocarbons) in the atmosphere Scientists refer to this as the enhanced greenhouse effect
This increase is mainly due to human activities such as the burning of fossil fuels, deforestation, the use of fertilisers in agriculture, decomposition
of garbage and the use of refrigerators and air conditioners
This has led to global warming, which has changed the Earth’s atmospheric balance with effects in Polar Regions Part of the ice caps is melting, raising the height of the world’s oceans and producing floods in low-lying areas of the world
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English Toolkit 1 - Natural Sciences
newspaper or magazine article or do research on alternative sources
of energy What are their advantages and disadvantages?
a What is global warming causing?
a to go up in strength or amount:
b to become less warm:
c the gaseous mass surrounding the Earth:
d equilibrium:
e The change in the Earth’s atmospheric balance due to global warming
d What changes has global warming brought about?
e Which are the causes of global warming?