Heller: 'I have worked as a contract software developer on climate and weather models for the US government.' - The radiative transfer models used by government climate scientists show that going up to 550 PPM or even 1000 PPM CO2 will make minimal difference to the radiative balance of the atmosphere.
'The temperature record of both the US and the world has been massively altered since older versions, almost invariably to create the appearance of more warming, and in some cases to create warming where there is none.'
'If you want to learn more about climate history, I have assembled a large collection of old newspaper articles about the weather below 350 PPM CO2. If you read through this, you will understand that lowering CO2 will not make the weather any better, or worse.'