"The orthodoxy of the 1970's was overthrown by further research."

Correct. Every invalid scientific orthodoxy is eventually overthrown. Some last far longer than others, though. The present one about manmade global warming may be invalid too. If it is, it will eventually be overthrown.

Simply study science history in the western world. Look up the story of a number of new and revolutionary scientific notions that were advanced by some lone scientist. Observe how often the general scientific community pooh-poohed, rejected, ridiculed, and ostracized those who came forward with a radical new theory that challenged an old orthodoxy. It's a story that has been repeated many times in all human authority structures, not just in the science community. The truth, however, prevails in the end, because it finally becomes undeniable. I trust it will prevail in this case too, but I don't have a crystal ball with which to predict how it will go with absolute certainty. If I did, I'd be infallible. ;-) And I don't think any of us are.

Agreed?