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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.

Purpose Islands have long been discussed as refuges from global catastrophes; this paper will evaluate them systematically, discussing both the positives and negatives of islands as refuges. There are examples of isolated human communities surviving for thousands of years on places like Easter Island. Islands could provide protection against many low-level risks, notably including bio-risks. However, they are vulnerable to tsunamis, bird-transmitted diseases and other risks. This paper aims to explore how to use the advantages of islands for survival during global catastrophes. Design/methodology/approach Preliminary horizon scanning based on the application of the research principles established in the previous global catastrophic literature. Findings The large number of islands on Earth, and their diverse conditions, increase the chance that one of them will provide protection from a catastrophe. Additionally, this protection could be increased if an island was used as a base for a nuclear submarine refuge combined with underground bunkers and/or extremely long-term data storage. The requirements for survival on islands, their vulnerabilities and ways to mitigate and adapt to risks are explored. Several existing islands, suitable for the survival of different types of risk, timing and budgets, are examined. Islands suitable for different types of refuges and other island-like options that could also provide protection are also discussed. Originality/value The possible use of islands as refuges from social collapse and existential risks has not been previously examined systematically. This paper contributes to the expanding research on survival scenarios.

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