Climate change is defined as the shifting of world’s climate due to increase of earth temperature. the increase of average temperature in the earth atmosphere is mostly bring by the concentration of greenhouse gases such as methane , carbon dioxide and other traces element which is harmful and poisonous .it is known that greenhouses gases are beneficial to existence of human kind for the maintenance and the balance of the warm within the earth surface- the sun produce sun rays which has a hotness of more than 6000Co , afer than sun light rays leave the sun’s surface 55% of it is reflected by the ozone layer : which is a colorless gas mostly O3 soluble in al kalis and cold water and it acts as screen for ultra violet radiation the rest of 45% percent 5% of it is reflected by the greenhouse gases , dust particles which is present mechanically within the atmosphere
For the last fourth decades climate change has been an issue of concern as the continuous rapid population growth , depletion of ozon layer shown an obvious impact to existence of mankind and this is why the sessions of environmental affairs were given great priority at the united nation as the most of 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 deterioration of the ecosystem on which we depend for our wellbeing. The sessions and the conference organized by the united nation take a obvious role for the elimination of factors that contributes climate change or may accelerates its impact . the developed countries make a commitment to provide assistance aids to the developing and those who suffers economic crises especially in the third world countries . This aids include subsides , capacity building , consultations, awareness and other facilitations . this in turn led to s the innovation of other alternative source of energy to reduce fossil fuels and emission of chlorofluorocarbon to the atmosphere which causes great damge to the ozon layer which is an important layer for the absorption of ultra violet radiation form the sun . the projects pioneered by the united nation were benefited by developing countries especially the African while the others rejected among those rejected include india and the lied countries across the Asian continents .
Climate change affects people in far reaching –ways .impacts related 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 ecosystem and others – and are expected to increasingly disruptive throughout this century and beyond . climate change affects human health and wellbeing through more extreme weather events and wildfires , extreme , decreases air quality and diseases transmitted by insects . climate disruptions to agriculture have been increasing and are projected to become more severe over this century , a trend that would diminish the security of food supply in many parts of the world . surface and ground water supplies in some regions are already stressed and water quality is diminishing . in some regions prolonged periods of high temperatures associated with droughts contribute to condtions that lead to larger wild fires and longer fire seasons . for coastal community sea level rises , combined with coastal storms has increased the risk of ersion , extreme heat sea level rise and heavy down pour are affecting infra structures like roads rail lines and military bases . in other word siome climate change currently have beneficial effects for specific sectors or regions . for example current benefits of warming include longer growing seasons for agriculture and longer ice –free seasons for shipping on the great lakes at the same however , however longer growing seasons along with high temperatures and carbon dioxide level can increase pollen production . as we mentioned before climate is caused by the increase of the greenhouse gases which is due by human activity . the main causes can be seen from the following ;
Burning coal , oil and gas: the burning of coal and gas produces carbondioxide and nitrous oxide which is harmful gases
Cutting down forest: it is known that trees help to regulate the climate by absorbing CO2 and other green house gases from the atmosphere . so when they are cut down that beneficial effect is lost and the carbon stored in trees is released into the atmsopshere adding to the green house effect
Increasing livestock farming : cows and sheep produce large amount of methane when they digest their and this 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