Slide 29 in this series.
What we have learned about CO2 is that it is not as bad as AGW would have us believe. Humans cannot affect the earth's atmosphere other than with polution, adn CO2 is not polution.
Water Vapor is the big bully in the atmosphere and with the dominance of oceans on the earth's surface the earth's climate can be seen as not affected by humans to any appreciable extent, as far as we know currently.
NEXT: Comparing 2 temperature curves from different periods in the last century.
The links below are to the pages or slides in this section, which covers the science of CO2.