Instead of answering Monbiot’s questions, Plimer has responded with his own set of questions. I suspect that this is a tactic so he can weasel out of answering Monbiot’s questions. My favourite question from Plimer is this one (which isn’t even a question):
6 From ocean current velocity, palaeotemperature and atmosphere measurements of ice cores and stable and radiogenic isotopes of seawater, atmospheric CO2 and fluid inclusions in ice and using atmospheric CO2 residence times of 4, 12, 50 and 400 years, numerically demonstrate that the modern increase in atmospheric CO2 could not derive from the Medieval Warming.
Yes, Plimer is really arguing that recent CO2 increases were caused by Medieval Warming. Isotopes measurements show that this increase mainly came from burning fossil fuels, but my link goes to RealClimate so Plimer will dismiss it with one of his usual ad hominem attacks.