It's just one climate signal suggesting we may now be getting dangerously close to some irreversible climate tipping points that scientists have warned about. WATCH | All these heat waves are the new normal, scientists say:Début du widget Widget. Signs of approaching climate tipping points include instability, swinging between extremes like the rocking of a canoe before it actually tips. "Even if we cross some tipping points, we can still reduce the risk of crossing others by cutting emissions, which will also reduce negative climate change impacts that aren't triggered by tipping points," he said. "If some of these tipping points are crossed … there are these big impacts that can be locked in, he said.