All I needed to do was to show that CO2 is toxic and that we don't want it when we combust fossil fuels, we want the energy.
It's not toxic at all in any quantity that will be released from the burning of fossil fuels. It's a red herring and you do the whole debate a disservice by even mentioning it.
Nope, if that were true, we'd not have rising CO2 since those plants "who just adore extra CO2" would be taking it up.
Well, they are taking it up - just not as fast as we can burn it. They take it up on the geological time scale - we are burning it all in a few centuries.
And, yes, it DOES harm animals at this level: Climate change, dumbass.
Climate change is likely to help some animals and hurt others.
No animal likes to be in a species that goes extinct: it's quite harmful.
No, but the remaining species are quite fond of the newly-plentiful resources.
I'm not in any way arguing that man-made climate change is good, but your arguments are not really relevant and calling an ally a "dumbass" seems pretty counter-productive to your implied goals.