Sure, in summary.

A rogue planet approached the earth. Thankfully we knew about it decades in advance,
But due to its slow movement away from the sun humanity could not comprehend the scale of the problem. 
Eventually it caused the world to cool down and the sun's rays started to weaken.
This caused the crops to fail and the climate then rapidly changed. Then came the human suffering followed by social unrest. 
Humanity's attempts to stop it had been futile.
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