You have to provide proof for the claim that humans significantly alter the energy levels of the system. These things you mention have happened before without human interference.
Yes, and every time they happened before it was a mass extinction event. We have proved these things are caused by us. Through sataelite observations and isotope measurements.
For reference please check this graph that CSW has recently linked in his twitter feed:
Wow, thanks for this. He really is making sure he loses all reputabilbity. Hope to seem him fork off in November. The guy really is a fool.
Proving that humans do have a significant impact on climate change is not possible yet because we have way too little data. The warming right now could as well not be caused by humans.
We can actually measure our contribution to climate change directly. So it is not only possible, but measurable.
You measure things that according to a THEORY change the climate. That theory is not proven, since it can't be proven yet, due to lacking data.
You can actually measure the energy imbalance directly...
