Like #EarthOvershootDay the #DoomsdayClock is a metric driven by good intentions but done with a questionable methodology. Where Overshoot Day fails to capture huge problems like species extinction, there’s no scientific method what a second or hour on that “clock” means. Climate change, cited in the current decision to move the clock four seconds forward, will lead to long-lasting suffering by billions, but not human extinction. There are better metrics, like #PlanetaryBoundaries.