The only thing we know for certain is that we can't know anything for certain. Unless, of course, you're one of those reality deniers:
The 17-year pause in global warming is likely to last into the 2030s and the Arctic sea ice has already started to recover, according to new research.
A paper in the peer-reviewed journal Climate Dynamics – by Professor Judith Curry of the Georgia Institute of Technology and Dr Marcia Wyatt – amounts to a stunning challenge to climate science orthodoxy.
Not only does it explain the unexpected pause, it suggests that the scientific majority – whose views are represented by the UN Intergovernmental Panel on Climate Change (IPCC) – have underestimated the role of natural cycles and exaggerated that of greenhouse gases.
I don't deny there are global warming issues. And I don't disagree that we (mankind) have had something to do with it. I just have never been on the side that said that's the ONLY reason. Just as with everything else, the more we think we know, the less we really do.