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Living within planetary limits requires attention to justice as biophysical boundaries are not inherently just. Through collaboration between natural and social scientists, the Earth Commission defines and operationalizes Earth system justice to ensure that boundaries reduce harm, increase well-being, and reflect substantive and procedural justice. Such stringent boundaries may also affect ‘just access’ to food, water, energy and infrastructure. We show how boundaries may need to be adjusted to reduce harm and increase access, and challenge inequality to ensure a safe and just future for people, other species and the planet. Earth system justice may enable living justly within boundaries.

The Sustainable Development Goals (SDGs) and the Paris Agreement on climate are the key international agreements to deliver a sustainable future. They are a compromise between the scientifically necessary and politically possible to achieve global sustainability. Agreed in 2015, they constitute a radical departure for international policy with no precedents and are beginning to shape national policy, civil society and business decisions. We argue that these new frameworks represent the most important institutional innovation to emerge in recent years. They mark a shift away from international rule-making towards a system based on goal setting. This reflects a theory of societal steering or what we commonly think of as governance that differs sharply from mainstream regulatory systems by Pauwelyn et al. (Eur J Int Law 24:733–763, 2014). Given that achieving the Paris Agreement and the SDGs will require transformation of societies at all levels, it remains unclear how existing instruments, policies, and even institutions will adapt to this new global governance strategy. The key to success, we argue, will be “action coherence”, whereby actions initiated to fulfill individual SDGs are coherent across efforts to achieve the full set of SDGs over the long run.

Cities are rapidly increasing in importance as a major factor shaping the Earth system, and therefore, must take corresponding responsibility. With currently over half the world's population, cities are supported by resources originating from primarily rural regions often located around the world far distant from the urban loci of use. The sustainability of a city can no longer be considered in isolation from the sustainability of human and natural resources it uses from proximal or distant regions, or the combined resource use and impacts of cities globally. The world's multiple and complex environmental and social challenges require interconnected solutions and coordinated governance approaches to planetary stewardship. We suggest that a key component of planetary stewardship is a global system of cities that develop sustainable processes and policies in concert with its non-urban areas. The potential for cities to cooperate as a system and with rural connectivity could increase their capacity to effect change and foster stewardship at the planetary scale and also increase their resource security. © Royal Swedish Academy of Sciences 2012.