“There is no definitive scientific proof, through real-world observation, that carbon dioxide is responsible for any of the slight warming of the global climate … But there is certainty beyond doubt that it is the building block for all life on Earth and that without its presence in the global atmosphere at a sufficient concentration this would be a dead planet.” – Dr. Patrick Moore

Canadian Dr. Patrick Moore has been an ecologist and environmentalist for more than 50 years and is a co-founder of Greenpeace.