Climate sceptic Christopher Monckton says New Zealand groups appeared to try to censor his views during his tour, but adds: "I get this all around the world."
Viscount Monckton said the groups were terrified by his eloquence and his firm grasp of climate science.
An Auckland debate hosted by sceptical group Climate Realists failed to secure an opposing voice for the former journalist and politician.
Viscount Monckton was not disappointed but was disturbed by what he felt were attempts at censorship.
He said : "I don't demand that anyone should agree with me, or should listen, but that they should demand that I shouldn't be heard, that seems a bit too much like what used to go on in Germany before World War II.