 One approach put forward by Henry Shue argues that rights to emit greenhouse gases should be distributed so as to meet peoples’ “subsistence” needs, and that such emissions should take priority over “luxury” emissions (Shue 2014: chapter 2). The focus on meeting basic needs here seems hard to dispute. Many philosophers and environmental campaigners have, however, argued that equality should be the guiding principle—and not subsistence (or not merely subsistence).