In message testing across 23 countries, our responsibility to future generations consistently ranks as the most compelling rationale for climate action. In this experiment, the narrative focused on protecting future generations produced the biggest lift in support for climate action in every country surveyed. Comparing the level of strong support (5 on a 1-5 scale) for government climate action by the groups exposed to each of these narratives, versus the control group who saw no narrative, reveals the “lift” that each narrative generates. The differences are clear. Averaged across all 23 countries, the generational urgency narrative lifts support by 11 percentage points; polluter accountability lifts support by 7 percentage points; and the climate progress narrative lifts support by just 3 percentage point. The generational urgency narrative is the winning narrative in each country, as well as overall.