Look at the graphs, look at historical records in the rocks. Ask yourselves, did we cause global warming or are we merely part of it ? I think the graphs speak for themselves.
Yes it does speak for it self, possibly not in the way you think, though. The large scale graph shows that from -400000 to 0 carbon dioxide concentrations varied between ~190ppmv and ~300ppmv; changes occurred relatively slowly, the fastest up-ticks are on timescales of 1k-10k years (hard to be precise from this scale).
The new peak on the far right of this graph is unique in two ways:
-The absolute level is about 25% higher than any of the 4 previous peaks and about 40% higher than the average of the graph.
-The rate of change is completely unprecedented, about 90ppmv/200years, i.e. the vertical line inside the ellipse.
I am no expert in the matter, and I know that correlation does not necessarily imply causation. However, just judging from your graph, I see a unique feature in the data, nicely aliened with a drastic population increase of a certain two-legged critter (obviously not shown here) and a change of habits of said critter (massive burning of coal/oil).
So, unless you have a compelling alternate explanation I'll stick with man-made increase of CO2 levels.
Cheers,
Michael