Who has a moral responsibility to slow climate change?

Henry Shue’s latest book, The Pivotal Generation: Why We Have a Moral Responsibility to Slow Climate Change Right Now, is an excellent read, both clear and comprehensive. It is written in a way that makes it accessible to philosophers and non-philosophers alike. The book argues persuasively that the people alive today must take immediate and drastic action to tackle climate change, as the current decade will be crucial for determining how severe the impacts will become. Shue warns how a sharp division into past, present, and future is misleading when it comes to climate change and can obfuscate the extent of the responsibility that the current generations bear. For us to acknowledge our responsibility, we must recognise how deeply intertwined our lives are with both the past and the future. One of these innate deep connections between generations is the extensive time period that carbon emissions can continue to contribute to climate change, for dozens of centuries. The current generations have been bequeathed an energy system that relies on fossil fuels and that continues to add greenhouse gases to the atmosphere. For over two centuries now, the planet has been getting warmer as an unintended side effect of industrialisation. We are the first humans to understand the dynamics of the Earth’s climate and how human actions cause anthropogenic climate change. With the rapidly advanced scientific knowledge, it has become apparent that there is a need to quickly transition to a different energy regime. Shue points out that this knowledge has made us the first humans to recognise that action is required, but the urgency of the problem also makes us possibly the last to still be able to act before certain major threats are aggravated. With many irreversible climate change impacts, the date-of-last-opportunity to take action to prevent them might be very soon. According to Shue (2021, p. 6), “This gives us an awesome responsibility. Humans have accidentally set our own house on fire, and if we do not douse the flames while they are no more extensive than they are now, it may not be possible ever to extinguish them”. That is why we alive now are the pivotal generation. Although a sense of urgency runs through the book and the seriousness of the situation is made very clear, Shue steers away from fearmongering. He does not think that human extinction is around the corner, but underlines that we cannot rule out such threats until we stop feeding the beast. Unless we cap emissions at a relatively safe level and transform our infrastructure to net zero, we will keep on increasing risks to future people by “adding continuously to the mushrooming danger” (p. 23). The book stresses that the possibility of passing several tipping points adds to the urgency and the risks because when positive feedback mechanisms are triggered, climate change accelerates. These positive feedbacks can feed into each other, such as when warming seawater melts even more ice, with the possibility of a cascade of feedbacks if enough tipping points are passed. Such changes are irreversible and could themselves become further positive feedbacks. Shue (pp. 24–25) warns that it is “likely that the near future is the last chance to avoid passing significant tipping points and entirely possible that the near future is the last chance to avoid provoking a cascade of tipping points” (emphasis in original). While I applaud the general message of Shue’s book, I find that the brushstrokes he uses when identifying those responsible are a little too broad. The reason for this is twofold. Firstly, it is questionable as to how many of us really know enough about the risks we are leaving future generations with. Secondly, discussion in terms of generations underplays the big differences between the responsibility of different groups of actors within them. In what follows, I will elaborate on these points. I should note from the outset, however, that although I think that these are important issues, I find them to be points of clarification in an impressive and ambitious book on why our actions have such significance and why objections to urgent, large-scale climate action are misplaced