CO2 is NOT a toxic gas any more than O2 is a toxic gas. Both are necessary for life on this planet.
Co2 is the life blood for vegetation of all kinds, whereas O2 is needed for animated life.
Since this is from the EPA, I think Trump’s incoming EPA chief could rewrite the piece so that it is sensible.
ACTUALLY, O2 is a toxic, caustic, and highly flammable gas.
It is only because it is at such a low percentage in our atmosphere that it hasn't killed or burned everything on this planet.