By its geographical location within the arid and semi-arid area, Algeria is subject to adverse weather conditions. Algeria is highly sensitive to climate, especially in the highlands and the steppes which cover about 60% of North viable land. A climate change is inevitable and it will result in significant impacts, among other related to increased temperatures and rainfall, water resources scarcity and increased frequency of storms. Other impacts are studied: The loss of biodiversity and degradation of ecosystems, increased risk of famine, population movements, and health impacts. Climate change is causing a decline in reserves of soil water because of decreased precipitation and increased evaporation from the plant and soil due to the temperature rise. The increase in temperature will shorten the cycle plant which can be a negative factor by increasing water stress. However, in the case of Algeria, declining rainfall and increasing temperatures are unfavorable factors for both the soil and the plant. The consequence of the emphasis of water stress cause lower yields. The increase in soil evaporation will also increase the degree of salinity, also causing damage. The analyze of climate date shows that in the Chlef Region the three recent decades have been characterized by very marked developments, in particular by episodes of significant drought, upward trend for temperature and high rainfall. Climate projections for 2020-2050 and 2069-2099 horizons were performed using the average global multi-model (M3G) following two scenarios SRES RCP4.5 and RCP8.5. The approach to simulate the scenarios and time horizons for future successful changes in temperature and precipitation in relation to the data in the reference period 1979-2000. The results indicate an increase temperature accompanied by a slight increase in precipitation.
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