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. After being involved for 15 years in Greenpeace's leadership he left.  Why?

"When Greenpeace began, we had a strong humanitarian orientation, to save civilization from destruction by all-out nuclear war," he said. "Over the years the 'peace' in Greenpeace was gradually lost and my organisation, along with much of the environmental movement, drifted into a belief that humans are the enemies of the earth … As we shall see later in the presentation there is very good reason to see humans as essential to the survival of life on this planet."