For thelast fourth decades climatechange has been an issueof concern as the continuous rapid population growth , depletion of ozon layershown an obvious impact to existenceof mankind and this is why the sessionsof environmental affairs weregiven great priority at the united nation as the mostof the countries across the world confronts perpetuation of disparities between and within nations , a worsening of poverty , hunger , ill health and illiteracy and the continuous deteriorationof the ecosystem on which we depend for our wellbeing. The sessions andthe conference organizedby the united nationtake a obvious rolefor the elimination of factorsthat contributes climate change or may accelerates its impact . thedeveloped countries make a commitment to provide assistance aidsto the developingand those who suffers economic crises especially in the third worldcountries . This aids include subsides , capacity building , consultations, awarenessand other facilitations . this in turn ledto s the innovation of otheralternative source of energyto reduce fossil fuels andemission of chlorofluorocarbon to the atmosphere which causesgreat damge to the ozon layer which isan important layer for the absorption of ultra violet radiationform the sun . the projects pioneered by the united nationwere benefited bydeveloping countries especiallythe African while theothers rejected amongthose rejected includeindia and the liedcountries across the Asian continents .

Climatechange affects people infar reaching –ways .impactsrelated to climate change are evident across the world and many sectors important to society – such as human health , agriculture , food security , water supply , transportation , energy ecosystemand others – and areexpected to increasingly disruptivethroughout this century andbeyond . climate change affects humanhealth and wellbeingthrough more extreme weatherevents and wildfires ,extreme , decreases air quality and diseases transmitted by insects . climate disruptionsto agriculture have been increasing and are projected to becomemore severe over this century , a trend thatwould diminish thesecurity of food supplyin many parts of the world . surface and ground watersupplies in some regionsare already stressed and waterquality is diminishing . in some regions prolonged periodsof high temperatures associatedwith droughts contribute tocondtions that lead to largerwild fires and longer fire seasons . for coastal community sea level rises , combined withcoastal storms has increased the risk of ersion , extreme heatsea level rise and heavy down pour areaffecting infra structures like roads rail lines and militarybases . in other word siomeclimate change currently have beneficial effectsfor specific sectors or regions . for example current benefits of warming include longer growingseasons for agriculture and longer ice –free seasons for shipping on the great lakes atthe same however , however longer growing seasons along with high temperatures and carbon dioxide level can increase pollen production . as we mentioned before climateis caused by the increase of the greenhouse gaseswhich is due by human activity . the main causes can be seen from the following ;

Burning coal , oil and gas: the burning of coaland gas produces carbondioxideand nitrous oxide which is harmful gases

Cutting down forest: it is known that trees helpto regulate the climate by absorbing CO2 andother green house gases from the atmosphere . so when they are cut down that beneficial effect is lost andthe carbon stored in trees is released into the atmsopshereadding to the green house effect

Increasing livestockfarming :cows and sheep produce large amount of methane when they digest their andthis in turn adds effect to the green house gases

Fluorinated gases : produce a very strong warming effect , up to 23000t time greater than carbond dioxide

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