Models are too sensitive to increases in carbon dioxide concentrations in the atmosphere, he said. (cfact.org)
Your third concern, that there is no acceleration in the atmospheric carbon dioxide concentration in response to accelerated emissions does not seem to me to be correct. (theoildrum.com)
It remains to be demonstrated whether dumping iron at sea will be able to affect that loss — or have any impact on the rise of carbon dioxide concentrations in the atmosphere. (scientificamerican.com)