Several philosophers claim that the greenhouse gas emissions from actions like a Sunday drive are so miniscule that they will make no difference whatsoever with regard to anthropogenic global climate change (AGCC) and its expected harms. This paper argues that this claim of individual causal inefficacy is false. First, if AGCC is not reducible at least in part to ordinary actions, then the cause would have to be a metaphysically odd emergent entity. Second, a plausible (dis-)utility calculation reveals that such actions have a not-insignificant amount of expected harm. One upshot is that the near-exclusive focus in the literature on AGCC as a collective action problem is too restricted. The paper also provides several moral psychological explanations of why it is so difficult to comprehend individual responsibility with regard to global phenomena, including a reappraisal of Thomas Nagel’s view of the absurd.