Transcript GREEN HOUSE EFFECT - Liceo Scientifico di Stato Galileo

Liceo Scientifico “G. Galilei”
Pescara
A. S. 2012 – 2013
Nicoletta Corradi 2^A
English Teacher: Prof.ssa Miscia Roberta
• “Global Warming” is a word often studied at
school, read in books or heard on TV… but
what does the term mean exactly?
Global Warming
• When the solar energy travels through the
Earth’s atmosphere, several gases trap it, in
particular water vapour, carbon dioxide,
methane and ozone, which, while absorbing
the energy from the sun, prevent the heat
from escaping back into space.
What happens
Though only some energy passes back into space,
most of it remains trapped in the atmosphere and
causes the Earth’s heating.
The Greenhouse effect
• These gases are known as GREENHOUSE
GASES and their natural process is to
maintain the Earth’s average temperature
warm enough, making life on the globe
possible. This is the GREENHOUSE EFFECT,
which works exactly as a greenhouse.
• The main causes of global warming involve
human activities like: burning fossil fuels,
cutting down and burning trees, etc.
Clorofluorocarbons
• Such activities generate a lot of carbon
dioxide, which causes the imbalance of the
greenhouse gases in the atmosphere. The use of
hairsprays, fridges and plastic materials produce
dangerous gases, called...
CHLOROFLUOROCARBONS!
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Global warming has negative effects on…
WEATHER!!
AGRICULTURE!!
SEA LEVELS!!
PLANTS AND ANIMALS!!
PEOPLE!!
Global warming can change the amount of
rainfall on earth with more and more frequent
floods.
FARMING
• Extreme
climate
changes
and
hot
temperatures
can
also
cause
the
desertification of the land; consequently
farming becomes impossible.
• Increase in temperature is causing the melting
of glaciers, which are, though slowly,
progressively increasing water sea levels, with
the inevitable submersion of lands!
• Due to the temperature increase, many plants
and animals will be no longer able to survive,
so many species will rapidly become extinct!
• Because of these inevitable climate changes,
also our lives will be radically transformed.
Let’s do something now! Preservation means
survival. The life of our planet is our life, too.