Too much CO2, too little CO2; blah, blah, blah. Too much or too little for who? And for who where? I'll argue with a PhD. Anyone can be wrong about something, including those with superior education. Anyone who becomes dogmatic about the CO2 dangers has been inhaling too much CO2. Oxygen deprivation can do terrible things to a beautiful mind. My Wollemi is happy with however much CO2 there is. In fact, it told me it would do just fine if CO2 increased . It's a survivor. And don't anyone spoil our ideas (or illusions) about 'our' Wollemi's being dinosaur food. Kia, you go, girl.