Rather than "completely" maybe it would have been more correct to say "widely". The idea of global warming basically started in the late 60s with a very few scientists talking about it.
Rediscovering old previously discredited scientific papers from the late 19th and early 20th century doesn't make it date all the way back to then.
Rediscovering old previously discredited scientific papers from the late 19th and early 20th century doesn't make it date all the way back to then.