The EPA says that CO2 is toxic.
The rise in CO2 of 1:10,000 since the year 1900 is equivalent to packing an extra eleven people into Michigan Stadium. I added those extra eleven people in green below.
By contrast, human lungs generate 400 parts per 10,000 CO2, or an extra 4,400 people in the stadium. I added them in green below.
One could easily come to the conclusion that the EPA has no idea what they are talking about.