A new study has examined 20,736 scientific publications about climate tipping points. Several of those are estimated to be crossed around 1.5 degrees warming, i.e. any time soon: permafrost thaw, Greenland Ice Sheet, North Atlantic Subpolar Gyre.
https://theconversation.com/some-climate-tipping-points-are-being-studied-far-more-than-others-new-research-293614