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http://robinwestenra.blogspot.com/2016/03/carbon-emissions-highest-in-66-million.html
If you look over the entire … last 66 million years, the only event that we know of … that has a massive carbon release and happens over a relatively short period of time is the PETM. We actually have to go back to relatively old periods.
http://robinwestenra.blogspot.com/2016/03/carbon-emissions-highest-in-66-million.html