I'm not sure where any tipping point might be. I've heard 300 ppm carbon in the atmosphere is the safe line, and we're quite a ways above that.
My view is that even if the current warming trend is not anthropogenic -- and I'm reasonably convinced it is -- but even if it is not, it behooves us to minimize ghg output to avoid driving the natural cycle into a feedback loop that could be catastrophic. Better safe than sorry.
My view is that even if the current warming trend is not anthropogenic -- and I'm reasonably convinced it is -- but even if it is not, it behooves us to minimize ghg output to avoid driving the natural cycle into a feedback loop that could be catastrophic. Better safe than sorry.