A few years ago, 400 parts per million for carbon dioxide was widely cited as the tipping point for climate change. Now that we have passed that value, it has become common to say that it wasn’t really a tipping point, that it was symbolic or a milestone. Whether it’s a tipping point or a milestone, we have decisively passed it and CO 2 levels appear certain to continue higher. Source: Alchemy 4 The SoulIn contrast to these definitions, others say climate change at projected CO 2 levels may be reversible. Reversibility is important because otherwise it’s impossible, or at least very difficult, to do anything once you have passed the tipping point.

Source: Forbes March 16, 2017 21:56 UTC