I was watching part of a history channel show on ancient earth. They mentioned that there were very large increases in the amount of carbon-dioxide in the atmosphere in the time of the dinosaurs. This led to a lot of plant-growth and also a climate suitable for such “lukewarm-blooded” creatures. Carbon-dioxide must be great for life! But there was no mention of the acidification of the ocean, which is a major problem cited for using geo-engineering to create “global cooling” without getting a handle on carbon emissions. Anyone familiar with the issue want to enlighten me? Mitchell Porter?