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Global warming
1.
2.
3. This graphic shows the temperature and CO2 changes in the lastThis graphic shows the temperature and CO2 changes in the last
milleniummillenium
Since 1800 CO2 level has been increasing and rising until it has reachedSince 1800 CO2 level has been increasing and rising until it has reached
the high value of our time. The same has happened to the globalthe high value of our time. The same has happened to the global
temperature of our planet, with particular reference to earth athmospheretemperature of our planet, with particular reference to earth athmosphere
and oceanic water.and oceanic water.
4. ALL THIS HAS DANGEROUS
CONSEQUENCES EARTH and
MANKIND
5.
6.
7. 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.
8.
9. 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.
10.
11.
12. 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 wasthe 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.
14. 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.
15.
16. It is caused by solid waste: paper, glass, plastic…, (some are
biodegradable some aren’t)(some need to be burnt in suitable
places.
17. 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.