Well they have to come up with "something" so they can collect all that GRANT MONEY, to come up with a THEORY. It amazes they can go back billions of years and explain how they THINK it all happened, with a straight face.
However on a different note , I watched part of NOVA last night. Had to switch to a movie.
Seems we have global dimming now. I can't digest much more of the gloom and doom in big doses, I have to take it in increments.
NOVA | Dimming the Sun | PBS
I found this while researching for the NOVA article
Global Dimming (Contrails) Video
I "THINK" we do contribute to the global issues, but I don't have a degree to prove it.