I dont know why so many people jump on that "TAX TAX TAX" rope. Even is there a tax - SO WHAT???
And nobody said you need one to fight climate change. Its the industry that proposed CO2 tax, because they have known it will not work because of the rest of their lobby work. And so it happened. The price for CO2 ton should have been around 70$, thats what the scientists said. not the 7$ as it was and is now even lower at 6$.

That aside your first graphic is simply... lacking a bit. Here is a better one, with longer time frame:
http://xkcd.com/1732/

Regarding solar radiation: The 20XX years have been a long-time low on solar radiation, while the temperature average was record high.

And your assumption that CO2 emissions inevitably fall anyway is true, since the fossil fuel will run out in few decides, but then its way too late to prevent catastrophic rise in sea level, not to mention the storms and droughts etc.