I'm blocked from the PDF link. This may be the same article, although it's dated 2016: https://www.semanticscholar.org/paper/Carbon-dioxide-toxicity-and-climate

I'm blocked from the PDF link. This may be the same article, although it's dated 2016: https://www.semanticscholar.org/paper/Carbon-dioxide-toxicity-and-climate-change%3A-a-risk-Bierwirth/a53f3a6f7a0db8cfd006c51f19c76a68f3386f7e https://www.semanticscholar.org/paper/Carbon-dioxide-toxicit...