1. Climate change climate refer to the average weather condition of an area. It is a truism that any changes in climatic condition may affect agricultural production, pattern of rainfall, wind flow and migration of animal. 2. Global warming Continuous increase in the emission of Co, from different sources into the atmosphere affects the heat balance of the earth. Continuous increase in the concentration of green house gases in the atmosphere trap more heat and prevents the heat from the earth’s surface 3. Greem house effect Green house effect is another environmental crisis facing our world. Chlorofluoro carbons (Co2) carbon dioxide, Methane (CH4) and Nitrous oxide (N,0) are called as green house gases.