Is Global warning a symptom of Humans?

Now here is a novel idea.
If we look over the Earth and the things happened and happening over the past 50 years we can see:

USA blowing up Nevada under ground
French blowing up Nuclear in Atol ?? wherever in the Pacific
British testing Near Easter Island.

This is all fine and obviously not good,
But remember:
The Earth has a Molten core
The Earth moves and causes Earth Tremors
Earth Tremors cause Tsunami's
Volcanos have been more active and expected to become more
The Ice caps are on an axis which is changing in the Earths position of the sun

So for a novel idea, has anyone actually looked at the Earths evolution?
The question is, whther it is Human's fault for any changes?