Making mistakes in centuries and generations past would have consequences that we could overcome. We don’t have that luxury anymore.

Gore contrasts earlier eras—when societies could make large-scale errors yet still have time and ecological “slack” to recover—with the present, in which human activity has pushed planetary systems close to irreversible thresholds. The “luxury” he says we lack is time: climate change and related environmental stresses accumulate, and delayed action can lock in long-term consequences (sea-level rise, extreme weather, biodiversity loss) that cannot be quickly undone. The quote functions as a moral and political warning: prudence and incrementalism that might have been acceptable historically become dangerous when the costs of mistakes are global, compounding, and potentially permanent.