The recent changes in the climate have been linked with the increase in greenhouse gases (GHG) on the atmosphere in addition to anthropogenic activities and support emissions of other artificial chlorocarbons (Olanrewaju, 2003).
Climate change is also believed to result from the effect of global warming on the environment.
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All these human activities are threatening the nature and at the end, we ourselves are to face the consequences and are to be blamed.
(Professor David Ukali, chairman of NEST, Nov, 2010) David Ukali’s statement explains how human activities lead to the backlash we experience in our environment today.The increase has been higher in the semi-arid regions and lower in the coastal zone; the rate of change has increased since the 1970s.The consequence for the Nigerian people is a geographical pincer threat from desertification in the north and coastal erosion in the south.Global warming is regarded by many people to be the most serious environmental challenge of modern times (Giddens, 2006).Global warming refers to the gradual rise of the earth’s average temperature due to changes in the chemical composition of the atmosphere; it is believed to be caused in parts by humans, because the gases that have built up and altered the earth’s atmosphere are the ones produced in large quantities by human activities.Climate change is one of the most serious environmental threats facing mankind worldwide.Climate change may already be impacting Nigeria as manifested by increased flooding, delayed rains, enhanced desertification, increasing bush fires and food insecurity.Through a combination of overgrazing, abuse of woodland for fuel and increasingly unreliable rainfall, the Sahara is advancing at an estimated rate of 600 meters per annum, rising sea levels threaten Nigeria’s coastal regions the Niger Delta may be the source of oil wealth but its low-lying terrain crisis-crossed with waterways makes it extremely vulnerable to flooding and salinization i.e.the build-up of salts in soil eventually to toxic level for plant.Global warming means that many dry areas are going to get drier and wet areas are going to get wetter.Peer-reviewed research accepted by the Journal of Geography and Regional Planning concludes that Nigeria’s average temperature has risen by 1.7 degrees in the period 1901-2005.