I want to know how we will recognize when our CO2 PPM is approaching 'Pre-Sat'/Sublimation of our atmosphere. I'm thinking if we recognize that our oceans are dying(blue green aglae and phytoplakton dying off), and some species that pollinate our flowers(bumble bees and honey bees) are going extinct,, doesn't that indicate Earth is nearing a 'breakdown' within its BioSphere? I am almost certain that this present '379' number is very close, and in another thread, someone said that '450' might be it. I would hope that those who calculate our new growing economic powers and their contribution to global warming, will recognize that old computer models are possibly obsolete/ineffective, and that this new Paradigm poses a direct threat without knowing if A Synergy Effect can occur at some point soon, without having enough Bio-Mass to 'carbon sequester' the building atmospheric intoxicants/pollutants.. I view our atmosphere as the equivalent to our own lungs(or blood gases), and we all now that there is a threshold of oxygen-co2 carrying hemoglobin, before problems occur Also, how can that number be calculated? *I really hope someone can answer this(another thread touched upon this). thankyou Please someone answer, I've been very panicky lately, and I need to know if anyone is listening to this(I only had one thread where I received responses so far).