You are so clueless, Dyson's assertion is CO2 makes the planet

greener because plant photo-synthesis bottleneck is CO2, while supply of water and sunshine is abundant.  

The assertion of effect of CO2 on temperature is due to the green house effect.  What's disputed is how big the effect is.

So where is the contradiction?

You really are completely scientifically illiterate, aren't you?

Have you ever passed a college level physics course?

I don't think so.