Patrick Moore
Patrick Moore was one of the founders of Greenpeace.
He left the organisation due to what he describes as, “The mission, once noble, had become corrupted — political agendas and fear mongering trumped science and truth.”
He has become one of many vocal scientists on the climate change issue.
Recently he has published a book which has done very well for a self published book.

If you haven’t heard of him, here is a brief history of his life and journey, through the creation of Greenpeace and what caused him to leave the organisation.
The video gets stuck at the 5 minute mark. Almost symbolic of the issues with greenpeace.
I thought that was just my computer. Have updated the link which seems to work now. Thanks for letting us know