[AndyTheBear]

CO2 is GREAT for agriculture! This is not tenuous speculation like the "green house" effect, but overwhelming rigorously provable fact!

If you are against CO2 in the atmosphere you are against the planet being green.

[lepton]

CO2 is GREAT for agriculture! This is not tenuous speculation like the "green house" effect, but overwhelming rigorously provable fact!

That's one of the reasons that the bristlecone pine proxies that Mann used are considered "divergent"...modern levels of CO2 obviously greatly increase ring size. The thing going back in time is that they can't readily distinguish between wet and cool, nor do they collect environmental data year-round. The study Mann used for data to do his 98 and 99 studies even points out the trees are unreliable proxies for these reasons.