Actually you need to look a little closer into this. “Dr. Moore is a co-founder of Greenpeace and served for nine years as President of Greenpeace Canada and seven years as a Director of Greenpeace International. As the leader of many campaigns Dr. Moore was a driving force shaping policy and direction for 15 years while Greenpeace became the world's largest environmental activist organization.”
https://www.heartland.org/about-us/who-we-are/patrick-moore
So look a little closer. The current group of lefty globalists who wrestled control from those that started the group and were instrumental in bringing it to international fame have made every attempt to distance themselves Patrick Moore. This explains the reason why you left out the fact that he was a Director of Greenpeace International for seven years and repeated the party line about his history. The truth is more involved than how the commies currently in charge of Greenpeace characterize his history there.
The details can be found in his books. Here is the Amazon description of his book, “Confessions of a Greenpeace Dropout: The Making of a Sensible Environmentalist”.
Confessions of a Greenpeace Dropout: The Making of a Sensible Environmentalist is Dr. Patrick Moore's engaging firsthand account of his many years spent as the ultimate Greenpeace insider, a co-founder and leader in the organization's top committee. Moore explains why, 15 years after co-founding it, he left Greenpeace to establish a more sensible, science-based approach to environmentalism. From energy independence to climate change, genetic engineering to aquaculture, Moore sheds new light on some of the most controversial subjects in the news today
Nope, that just explains why the things that came up on my search omitted that information.
Personally I never cared for Greenpeace, even in its early days.