Planetary Protection Issues of Private Endeavors in Research, Exploration, and Human Access to Space: An Environmental Economics Approach to Backward Contamination

Abstract

Abstract Owing to recent changes in the structure of the aerospace sector and its relationship to government, the landscape of the space industry is now experiencing the emergence of a commercialization paradigm. Private space endeavors may soon be able to target the novel market segments of space research and exploration, space resources utilization, and human access to space\xa0and to further stimulate the growth of a new space economy. Thus, the interdisciplinary field of planetary protection has to keep abreast of these advances\xa0to avoid unnecessary complications that might hinder the useful reinvigoration of economic interest in the space sector. Planetary protection is defined as a set of guidelines that aim to prevent the forward contamination of celestial bodies with biological material from Earth and the backward contamination of the terrestrial biosphere with extraterrestrial biological material. The possession of the technical capabilities for access to space by more than one private entity is now formulating the public perception of a so-called “Mars Race” that raises significant questions with respect to potential forward and backward contamination issues. This work outlines an environmental economics approach to backward contamination. Specifically, the commercial activities on Mars that may pose backward contamination risks are those that require the return of people, material, vehicles, or other equipment back to Earth, such as the potential business cases of Mars tourism and commercial sample return. Although these activities do not seem to pose a realistic planetary protection risk at present, it would be prudent to consider them during policy-making. Earth-return missions from Mars are expected to generate vigorous public interest worldwide in the environmental, health, and safety risks related to a potential backward contamination incident. As these kinds of missions also involve a post-reentry phase on Earth for the recovery, transfer, reception, and distribution of the samples and for the handling of returned people and equipment, quarantine issues that have not been raised since the Apollo era may become relevant again. In the case of this kind of post-reentry commercial activities, various jurisdictions and laws pertain to the matter. However, public perception will play a key role, as it has done in other industrial development projects with a need for social responsibility. Drawing from terrestrial analogies of siting noxious facilities and other development cases with strong environmental justice characteristics, this work will explore the application of environmental economics as an approach to equitably balance the benefits and costs of future commercial space endeavors with a backward contamination risk.