Unfortunately, no one can predict which one wins out:

a) Mother Nature's cyclic event of global cooling.

vs

b) Man made factors influencing artificial rise in global temperatures due to CO2, etc.

We know A happens and will happen. We also know that B is happening and we're doing little to stop it.

What we don't know are the true global effects of B.

Honestly, I don't think anyone in our lifetimes will or could know. Now, those poor SOB's 200 years from now might have a different opinion on the issue.....

To me, it all boils down to how you want to leave this planet for your children and your children's children.