Presentation on theme: "Liceo Scientifico G. Galilei Pescara A.S. 2012 – 2013 Nicoletta Corradi 2^A English Teacher: Prof.ssa Miscia Roberta."— Presentation transcript:
Liceo Scientifico G. Galilei Pescara A.S – 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 Earths 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 Earths heating.
The Greenhouse effect These gases are known as GREENHOUSE GASES and their natural process is to maintain the Earths 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!
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. Lets do something now! Preservation means survival. The life of our planet is our life, too.