"The risks we describe are troubling not only for their magnitude but also for their uncertainty. We do not yet know the exact thresholds for many tipping elements, or how quickly tipping cascades might unfold. Evidence nevertheless shows that overshooting 1.5°C or even the current temperatures increases their probability. Uncertainty about where tipping thresholds lie is therefore not a reason for delay, but a compelling reason for immediate precautionary action."https://www.cell.com/one-earth/fulltext/S2590-3322%2825%2900391-4