Global warming is caused by increasing levels of greenhouse gases like carbon dioxide and methane in the atmosphere from human activities such as burning fossil fuels and deforestation. Research shows global temperatures have increased by about 0.5 degrees Celsius over the past 100 years and the rate of increase is accelerating, with the hottest years on record occurring in the past two decades. Potential impacts of further global warming include rising sea levels, more extreme weather events like droughts and hurricanes, species extinction, and spread of diseases. The United States is a large contributor to greenhouse gas emissions despite having only 4% of the world's population.

1. PRESENTATION
ABOUT
GLOBAL WARMING

2. Global warming is a phenomenon of increasing
the average temperature of the Earth's
atmosphere and oceans.

3. Global warming is caused by the bleed into the
atmosphere of greenhouse gases: mainly
carbon dioxide and methane. Greenhouse gases
prevent the escape of infrared radiation from
the Earth to space, causing heating of the Earth.
In other words, instead of heat to escape into
space, is collected in the atmosphere as the
thick blanket, causing a temperature increase.

5. Research shows that the reason for the existence of
global warming is human activity that is
responsible for the release of greenhouse gases into
the atmosphere. In practice this means, for
example, driving a car, traveling jets, the use of
electricity from a nearby power the combustion
coal, burning wood or formation of certain
agricultural processes (such as rice cultivation).
Significant impact on the level of greenhouse gases in
the atmosphere has also deforestation. Trees are
able to collect carbon dioxide from the atmosphere
and converting it into oxygen. As a result the
cutting woods, man reduces the ability to remove
CO2 from the atmosphere.

6. Yes. This is demonstrated by data from several sources,
even from the National Climatic Data Center, which
since 1880 explores the average temperatures on land
and evaluations on the northern and southern
hemispheres. NCDC is the world's largest institution of
collecting weather information.
From their data shows that about 50 years the average
temperature increases. What's worse, these data can
also be inferred that this increase is not stable, but in
recent years even faster, as evidenced by the fact that
all the highest average temperatures for each month
fall in the last 10 years, and the 10 hottest years in
history measurements fall on the years since 1990.

7. Yes. It would seem that an increase in the average temperature of only a few degrees
Celsius would not have a major impact on the climate, but it may involve a number
of different effects. Appropriate to envisage them is obviously very difficult and
you may come across conflicting information . However, over time , scientists can
better interpret facts and to predict events that might occur . Here are some of the
most important changes that may cause global warming : Raising the level of the
oceans and seas of 9 cm to 88 cm by the year 2100 . Such an increase in water level
can cause flooding during storms and storms , seasonal flooding , and in some
areas completely flooded ( Florida peninsula , San Francisco Bay region ,
Netherlands , Beijing). Unprecedented drought and heat can cause water
shortages , fires and the death of tens of thousands of people ( such as during a
heat wave in Europe in 2002) . Ironically, at the time of occurrence of droughts and
heat waves in other regions may reach unprecedented storms, rain and mudslides .
Reduce the population of certain plants and animals. In some cases, an increase in
temperature can cause the total extinction of certain species of fauna and flora that
will not be able to adapt to climate change. Risk of diseases transmitted by
mosquitoes , insects and rodents in areas where these diseases were previously
unheard of.

10. United States. Despite the fact that the U.S.
population is only 4% of the population on
Earth, it produces up to 25% of all impurities
formed during the combustion of fossil fuels
(coal, oil, gas). Interestingly, the United States
thus pollute the environment more than China,
India and Japan put together.

11. Presentations
prepared
by
Miłosz Jurek
Kl.VI b