From what I understand it led to (young) people leaving the countryside to live in cities. This lead to large congregations of unhappy unemployed young people, all new to a particular area. These people then grouped up and protested about the ruling regime, which was the start of the current crisis.

Exactly, that's a good summary as far as I understand it. In other words, we're already seeing the impacts of food insecurity as a result of climate change and it will only get worse from here.

None of the previous comments on this topic indicated that the food instability was caused by climate change. Are you just assuming that?

From what I can recall it is due to an overlong drought. This could be due to climate change or not.

There are arguments from both sides: https://www.inverse.com/article/25318-aleppo-syria-conflict-... http://www.sussex.ac.uk/broadcast/read/41428

Also worth remembering that something as complex as the Syrian Civil war is bound to have multiple causes.