The planet has been through some narly shifts over the ages/epochs...and not a lot of them were condusive for human life. So we'll go the way of the dinos, and the Earth will re-regulate over many more epochs...
It's so funny to me to see how arrogant our current human mindset is. Like we can stop these huge natural shifts from happening. The only reason we've fucked things up so badly is the overpopulation and mass release of carbon from our expansion over the planet. It reminds me of the line from The Matrix where Agnet Smith describes humans as nothing more than a virus. As I am studying Anthropology, and seeing how early civilizations lived within and outside of their means, I can fully appreciate the concept. 
The next 50 years are going to be a very bumpy ride. All the models that give us 100 years are bullshit, we're circling the drain as a species...
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