Answer and explanation:
A good example is the Seljuk conquest of Baghdad as a result of the climate conditions in Abbasid Empire that caused droughts, increased famine and disease and made the empire vulnerable. Consequently, Seljuq Sultan Muhammad of Hamadan and Qutb ad-Din of Mosul lay seige to the empire in 1157 and sort to sack it and take it from Caliph al-Muqtafi who defended his empire
