Augustus
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First ask yourself what is causing the refugee, and genocide issues; at the present time it is not climate change, it is terrorism.
The crisis is due to the Iraq War and the Arab Spring which created the conditions for IS to gain power. The Iraq war was an American led folly.
The Arab spring, what caused that? The answer is not any one thing. One thing you might have noticed though is rising prices for basic foodstuffs, this has a major effect on many people in the developing world.
It is highly likely that this had at least some impact Arab Spring. I'm no saying it caused it, or even that it was caused by global warming, many other factors such as financial speculation affect commodity prices also. I'm also not saying it didn't cause it. I just don't know.
It's just an example of how things have the potential to effect societies, and cause unpredictable consequences.