Do I cause global warming, climate change and their related harms when I go for a leisure drive with my gas-guzzling car? The current verdict seems to be that I do not; the emissions produced by my drive are much too insignificant to make a difference for the occurrence of global warming and its related harms. I argue that our verdict on this issue depends on what we mean by 'causation'. If we for instance assume a simple counterfactual analysis of causation according to which 'C causes E' means 'if C had not occurred, E would not have occurred', we must conclude that a single drive does not cause global warming. However, this analysis of causation is wellknown for giving counterintuitive results in some important cases. If we instead adopt Lewis's (2000) analysis of causation, it turns out that it is indeterminate whether I cause global warming (etc.) when I go for a single drive. Still, in contexts where we seek to control or understand global warming, there is a pressure to adopt a more fragile view of this event. When we adopt such a view, it turns out that a single drive does cause global warming (etc.). This means that we cannot like Sinnott-Armstrong (2005) and Kingston and Sinnott-Armstrong (2018) reject the idea that I should refrain from going for a leisure drive simply because such a drive does not cause global warming. Keywords Causation. Causing harm. Causal influence. Global warming. Walter Sinnott-Armstrong. David Lewis If I go for a leisure drive with my gas-guzzling car, am I then causing global warming and its related harms? In BIt's not my fault: Global Warming and Individual Moral Obligations^(2005) Walter Sinnott-Armstrong makes the case that I do not. This is the claim I question in this paper. Sinnott-Armstrong's paper has been extensively discussed, (for instance by Braham and Van