Judging from the ice on the South pole, they could determine what the air was filled with many years ago.
In the ice are a lot of small air bubbles
When it's snowing, air bubbles are included and by the pressure of following snow falls, they can't escape anymore. Under this pressure,
snow is packed together and compressed to ice.
So it happens that the air bubbles from different sheets give different information about our past.
Long ago people only used fire to warm and cook, and not much carbon dioxide
got in the air.
By scorching complete fields and regions, the number on carbon dioxide in the air increased more and the invention of the steam-engine and the
industrial evolution made it grow exponentially.
This carbon dioxide is a fundamental ingredient for plants to grow.
With the help of sunlight as source of energy, it is absorbed and processed to cells.
The oil and the coals that we burn today are the remains of earlier wood and animals and
the carbon dioxide that is liberated in the process, comes from the atmosphere of the earth.
Nowadays, this carbon dioxide is too soon and too much liberated.
By the increase of the carbon dioxide in the air, the earth becomes more isolated to warmth,
while the solar radiation is not distracted well enough and the earth warms up.
By this warming-up (greenhouse effect
) the sea surface rises and the ice melts on the poles,
with (negative) consequences for the entire world.
In the gas bubbles one group of elements misses, namely the CFCs (chlorofluorocarbons). These gasses are used in refrigeration and
aircos, as propellant in aerosols, and as industrial solvents.
The injurious effect of CFCs start by minus 80°C. These extreme cold is achieved in the upper-strata of the atmosphere above the poles
in the winter, when the sun isn't there to warm the air. Ozone
is degraded by this temperature,
under influence of free chlorine atoms, which become free by degradation of freon.
is a toxic, very reactive combination of three oxide atoms.
It is concentrated in a 50 km thick layer, which start 16 km above the earth surface,
and forms the lowest strata of the atmosphere. These ozone layer protects the earth
against the injurious effects of ultraviolet rays.
Each year in the winter the ozone layer gets weaker above North and South pole.
The ozone hole was first discovered in 1981. The effect of the missing UV-filter becomes
perceptible, by the first sunbeams in spring. The ultraviolet rays of the spring-sun
puts a start to many complicated chemical reactions, resulting in an active process,
while chlorine and other gasses react with the ozone.
The ultraviolet rays from the sun can come through the ozone hole and causes a lot of trouble.
Australia and New-Zealand has the highest number on skin-cancer patients.
On Tierra del Fuego in South America, a lot of sheep and goats suffer from eye-trouble and the
shepherdess too have diseases of the eye.
They also suspect a decreasing of plankton, which can have a catastrophical impact on the whole food-chain.
Because I'm anything but an expert to this matter, I maybe wrote something wrong.
So please correct me and/or check out other sources, when you want to find out more on this subject.
next chapter: Tourism