global warming
TRANSCRIPT
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This graphic shows the temperature and CO2 changes in the last This graphic shows the temperature and CO2 changes in the last millenium millenium
Since 1800 CO2 level has been increasing and rising until it has reached Since 1800 CO2 level has been increasing and rising until it has reached the high value of our time. The same has happened to the global the high value of our time. The same has happened to the global temperature of our planet, with particular reference to earth athmosphere temperature of our planet, with particular reference to earth athmosphere and oceanic water.and oceanic water.
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ALL THIS HAS DANGEROUS CONSEQUENCES EARTH and
MANKIND
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Hozone layer acting as a protective screen Hozone layer acting as a protective screen
against ratiatiosns and ultraviolet rays becomes against ratiatiosns and ultraviolet rays becomes
thinner every year, due to some chemical thinner every year, due to some chemical
compounds containing Fluorin and Chlorine. compounds containing Fluorin and Chlorine.
These are not directly dangerous for Humans These are not directly dangerous for Humans
and animals but they cause irreparable damages and animals but they cause irreparable damages
to athmospfere and vegetation.to athmospfere and vegetation.
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The solar rays pass through the atmosphere; when they are in contact with earth they should be reflected with a lower intensity. In the athmosphere there are some particles that don’t let the rays to be released.In the last time the particles have been increased avoiding the rays to be released or better they have caused their return to the earth provoking the planet warming.
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It is a consequence of the It is a consequence of the increased concentration of increased concentration of greenhouse gases in the greenhouse gases in the athmosphere. In the last 150 athmosphere. In the last 150 years the average global years the average global temperature has increased of temperature has increased of 0,7/0,8 gradi. The year1998 was 0,7/0,8 gradi. The year1998 was the hottest year, followed by the hottest year, followed by 2005 and 2006. The bad news 2005 and 2006. The bad news are that, even if all the gases are that, even if all the gases emissions were stopped today, emissions were stopped today, their negative effects would go their negative effects would go on for some centuries. on for some centuries.
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ALL THIS IS CAUSED BY POLLUTION
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It is a mass of more substances in such concentration as to be able to modify the normal environmental conditions.These changes are dangerous for man and environment. The main sources of pollution are the emissions from industries and the burning processes and gases emissions from urban traffic.
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It is caused by solid waste: paper, glass, plastic…, (some are biodegradable some aren’t)(some need to be burnt in suitable places.
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Our climate has changed over the past centuries. The Earth has become hotter and hotter. This phenomenon is called global warming. Scientists think this could be due to us altering our climate and environment through agricultural and industrial practices.The rise in surface temperature that results from trapped solar radiation emitted by the atmosphere is called the greenhouse effect. The greenhouse effect gets its name from the high temperature that is present. This temperature and humidity are often much higher in a greenhouse than in the air outside.The atmosphere doesn’t allow radiation to escape into space and so the temperature rises. The greenhouse effect is necessary because without it the earth would be too cold for humans to survive, it is essentially a good thing. Without it we could freeze! It is changes in the greenhouse effect that could have undesirable consequences for us.The greenhouse effect depends on gases present in the atmosphere that strongly absorb radiation. These are called greenhouse gases. The greater the amount of a greenhouse gas in the atmosphere, the higher the temperature. Human activity has increased, so there are more gases being released into the atmosphere. These activities include deforestation and the burning of the fossil fuels. Human activities are changing the composition of the atmosphere. Greenhouse gases are increasing and the temperature is rising.
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Riduzione-Reduction
Riuso-Reuse
Riciclaggio-Recycling
Recupero-Recovery
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HELP
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