From the foregoing research work, the following can be deduced:
• Throughout the period of study, the country witnessed an average of 131.72 mm rainfall and the average temperature was 26.96°C.
• The trend analysis of the country-wide variation indicates that there is a general increase in rainfall and temperature over the years. The 0.756°C increase over the years appears to fall within 0.6±0.2 range predicted by the InterGovernmental Panel on Climate Change (IPCC, 2001).
• The correlated value of 0.199 throughout the country and the maximum value of 4.0407 mm rainfall variation per annum in the coastal areas suggest that the country is at the brink of global warming and the coastal areas are the worst hit.
• The gradual drying up of Lake Chad and the creeping down of the Sahara Desert are danger signals of the possible negative impacts of the temperature increase. An evidence of regional climate change in Nigeria is the current southward drift of the Sahara Desert which has been estimated to be about 5 km/year (Madueme, 1994). This incidence of increased drought is bound to impact negatively on agriculture and food supply.
Fig. 38.3.a Time series of average rainfall and the sequential version of the Mann-Kendall tests for the period 1971-2003.
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