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GREEN HOUSE EFFECT DEFINATION :- Green house effect is phenomenon by which certain atmospheric gases absorb and trape the infra-red radiation emitted by the planet which is reemitted to the planet as heat.
1. Shorter waves reach the surface. On receiving these strong wave the earth absorbs part of it and reflects back major part of it depending on Its own capacity
2. The “Kyoto Protocol” is the treaty that was signed by many countries to help prevent more green house gases. The united states is the biggest producer of green house gases. Producing about 25% of the gases associated with global warming Japan and Russia are the next biggest producer. 3. Forest are the areas where a great deal of photosynthesis occurs.
EFFECTS A slight increase in surface temperature, say 10 C can adversely affect the world food production. Rise in sea levels due to melting of ice also reverse flow of sea water into river ‘ Narmada ‘ 2005 Tied 1998 as world’s hottest year prevention
CONCLUSION without CO2the earth would be as cold as the moon. In the absence of green house effect the earth surface temperature would be aslow as -18oc .z
INTRODUCTION The ozone layer forms naturaly in the stratospere , where ozone and oxygen gas are always converting into each other contineouslyreapplyin the earth’s sun
MECHANISM:- 1. How the ozone layer forms and protect. Ozone is a bluish gas that is formed by 3 atoms of oxygen. When found on the surface of the planet ozone is considered a dangerous pollutant. The highest region of the stratosphere contain about 90% of all ozone.
Cfc’s which are man made gradually rise up into the ozone layer. Where u.v light breaks the components apart which release chlorine. A chlorine atom can steal an oxygen atom from an ozone molecule creating oxygen gas and chlorine monoxide (Clo) which effectively destroys ozone molecule. CFcl3 _______ CFcl2 + cl. Cl. + O3_____clo. + O2clo. + O ______ cl. O2 the radical clo. Can initiate a series of chain reactions which lead to destruction of upto 100,000 molecules of O3 without being destroyed itself in the process
EFFECT 1. Effect on marine organisms –phytoplankton and zooplankton “Plankton” are the collection small or microscopic organism including plants and animals. Fish are highly dependent upon phytoplankton as a food source. Since about 30% of all protein for human consumption comes from the sea. Pure water is transparent to u.v radiation. It is the presence of light scattering material that cause attenuation typically, there is about a 40% attenuation of u.v light at 0.5 meters bellow the surface resing to an 80% attenuation at 1.5 meter phytoplankton are highly sensitive to u.v light and that even existing levels of u.v radiation are highly toxic.
2nd EFFECT HUMAN HEALTH RISKS OF OZONE DEPLETION CAUSES SKIN CANCER :-
3rd EFFECT UV-B EFFECT ON TERESTRIAL PLANT :- UV-B EFFECT ON AQUATIC ECOSYSTEMS MOBILETY AND ORIENTATION MECHANISMS ARE IMPAIRED BY UV-B RADIATION. BECAUSE MOST ORGANISMS DO NOT POSSESS UV-B RECEPTORS.
4th EFFECTHARMFUL EFFECT OF INDUSTRIAL EFFLUENTS These chemicals include extremely toxic substance Which can cause allergies, damage vital brain, liver kidney and reproductive organs. And it is amazing that we know nothing about the toxic effect of 80% of the chemicals used. Phosphate fertilizer factories and thermal power plant generate large quantities of conventional solid wastes which are stored near the sites and cause pollution of soil.
How a hole forms in the ozone :- CFC’s contribute to the formation of the ozone. Chlorine and bromine are both substances that can destroy ozone. sep 10 2000 oct 6 1987
CONCLUSION :- It is estimated that 25% of the people born by the year 2075will die due to the cancer caused due to the explorations to ultraviolet radiation.