No causation of rising temperature with rising CO2

The earth has gone through many past episodes of warming and cooling - all without human intervention either way.
.
The problem then arises is differentiating contributions by man against natural variation.
.
The IPCC chose CO2 because it had to.
.
There is no other human contributed gas of any consequence even though, water vapor is 95% of all GHG's (CO2 is a mere 5% roughly).
.
Humans contribute just 4% of that CO2 anyway - so basically 0.2% is us.
.
All of this is simply to show how miniscule is the supposed measurement criteria that we're supposed to be able to observe - so they'd have us believe.
.
If the leaked emails show anything, it is that the scientists making these grand pronouncements haven't wanted us to see the data, and not one of them has actually shown causation of CO2 producing increased warming.
.
So far, its entirely circumstancial.
.
Free the data, free the code and stop using our tax money without accounting for what it produced.

Mikegeo