Greenpeace founder is a climate change denier

We find climate change deniers showing up in the damnedest place these days. Testifying before a Senate committee Greenpeace co-founder Patrick Moore stated, “There is no scientific proof that human emissions of carbon dioxide (CO2) are the dominant cause of the minor warming of the Earth’s atmosphere over the past 100 years."
You owe it to yourself to read Moore's entire prepared testimony. Sample this;

The increase in temperature between 1910-1940 was virtually identical to the increase between 1970-2000. Yet the IPCC does not attribute the increase from 1910-1940 to “human influence.” They are clear in their belief that human emissions impact only the increase “since the mid-20th century”. Why does the IPCC believe that a virtually identical increase in temperature after 1950 is caused mainly by “human influence”, when it has no explanation for the nearly identical increase from 1910-1940?