Long-Term Trajectories of Human Civilization (free PDF). Foresight, forthcoming, DOI 10.1108/FS-04-2018-0037.

Authors: Seth D. Baum, Stuart Armstrong, Timoteus Ekenstedt, Olle Häggström, Robin Hanson, Karin Kuhlemann, Matthijs M. Maas, James D. Miller, Markus Salmela, Anders Sandberg, Kaj Sotala, Phil Torres, Alexey Turchin, and Roman V. Yampolskiy.

Abstract
Purpose: This paper formalizes long-term trajectories of human civilization as a scientific and ethical field of study. The long-term trajectory of human civilization can be defined as the path that human civilization takes during the entire future time period in which human civilization could continue to exist.
Approach: We focus on four types of trajectories: status quo trajectories, in which human civilization persists in a state broadly similar to its current state into the distant future; catastrophe trajectories, in which one or more events cause significant harm to human civilization; technological transformation trajectories, in which radical technological breakthroughs put human civilization on a fundamentally different course; and astronomical trajectories, in which human civilization expands beyond its home planet and into the accessible portions of the cosmos.
Findings: Status quo trajectories appear unlikely to persist into the distant future, especially in light of long-term astronomical processes. Several catastrophe, technological transformation, and astronomical trajectories appear possible.
Value: Some current actions may be able to affect the long-term trajectory. Whether these actions should be pursued depends on a mix of empirical and ethical factors. For some ethical frameworks, these actions may be especially important to pursue.

An excerpt from the press release over at the Global Catastrophic Risk Institute:

Society today needs greater attention to the long-term fate of human civilization. Important present-day decisions can affect what happens millions, billions, or trillions of years into the future. The long-term effects may be the most important factor for present-day decisions and must be taken into account. An international group of 14 scholars calls for the dedicated study of “long-term trajectories of human civilization” in order to understand long-term outcomes and inform decision-making. This new approach is presented in the academic journal Foresight, where the scholars have made an initial evaluation of potential long-term trajectories and their present-day societal importance.

“Human civilization could end up going in radically different directions, for better or for worse. What we do today could affect the outcome. It is vital that we understand possible long-term trajectories and set policy accordingly. The stakes are quite literally astronomical,” says lead author Dr. Seth Baum, Executive Director of the Global Catastrophic Risk Institute, a non-profit think tank in the US.

The group of scholars including Olle Häggström, Robin Hanson, Karin Kuhlemann, Anders Sandberg, and Roman Yampolskiy have identified four types of long-term trajectories: status quo trajectories, in which civilization stays about the same, catastrophe trajectories, in which civilization collapses, technological transformation trajectories, in which radical technology fundamentally changes civilization, and astronomical trajectories, in which civilization expands beyond our home planet.

Available here: http://gcrinstitute.org/papers/trajectories.pdf