An early Greenpeace activist who left the movement over its political drift says global warming and more atmospheric carbon is no cause for alarm.

Patrick Moore, a senior fellow with the Frontier Centre for Public Policy (FCPP) made his comments in a YouTube livestream discussion with FCPP president David Leis.

Moore, who received a PhD in Forestry at the University of British Columbia in 1974, was active in the early days of Greenpeace. He left the environmental activist group after they contemplated a campaign against chlorine, despite how its use in water purification advanced human health.

The commentator, author, and former student of David Suzuki, says a long-term look at ecological history shows a warm earth is nothing new.