Climate change is one of the most important concerns throughout the world.Because the entire world will be affected by this phenomenon, much more attentions have paid to eliminate or alleviate its detrimental effects. To assess the effects of this phenomenon, different models and scenarios have been developed and applied. To assess the effects of changing temperature and carbon dioxide concentration as the main consequences of climate change on chickpea yield in Zanjan distinct, Iran, the SSM model (Soltani and Sinclair, 2011) was applied and 8 different scenarios were used. The scenarios were as: 1) current situation without any change in temperature or carbon dioxide concentration; 2-4): 2, 4 and 6 °C change in temperature without carbon dioxide change and 5-8) 2, 4 and 6 °C change in temperature along with doubled CO2 concentration. Our results indicated that increasing temperature did not changed mean yield, while increased maximum observed yield in studied region (changed from 14 to 35%). But, when temperature increased in parallel to doubled CO2, Mean yield also increased considerably, with 36 to 41.3 % increasing in comparison with Scenario 1). The Scenario 4 ( 4°C increasing temperature and doubled CO2) was selected as the superior scenario with the higher increase in mean yield, and reasonable increase in both minimum and maximum yields.

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