Climate scientist Tim Lenton explains how positive tipping points are accelerating the transition to a greener futureImagine sitting on an ordinary chair. It’s an analogy used by Prof Tim Lenton in his new book Positive Tipping Points: when a threshold is crossed and unstoppable change begins to unfold, a tipping point occurs. But what if it were possible to harness the power of positive tipping points? Here are four more positive tipping points that have already reached mass adoption, or have the potential to in time. Alt-proteins are at an earlier stage of adoption than other positive tipping points, but peak meat consumption has been reached in some countries