Ocean toxification during Permian extinction

I used to be on the fence about climate change. I have both scientific and technical training, so the simplistic arguments such as, it's only 400 ppm therefore it can't make any difference, those arguments don't work with me. My mother was a geology professor and I was her teaching assistant. I learned about all the major geological cycles including carbon. The Earth is a very complex system and the atmosphere is not a single layer. Water vapor, for example, can be both a warming (greenhouse) gas and a cooling gas. Carbon dioxide absorbs heat but it also re-radiates heat. If that re-radiated heat is going back into space it will cool the planet. If that re-radiated heat goes toward Earth it will heat the planet. The simplest answer I can give you is that we now have enough evidence of Earth-ward re-radiated heat from CO2 to say it is happening. We also have enough evidence that, just as in the Permian Extinction, increasing ocean acidification is happening and is a warning sign that we're GOING THE WRONG WAY!. Here's a really great video giving more detail: