The moon, Earth's closest celestial companion, is becoming a focal point for space exploration and commercial ventures. NASA's Artemis program aims to establish a long-term human presence on the lunar surface in the 2030s, while China, India, Japan, and private companies like SpaceX are also planning lunar missions. These endeavors raise the question: What does sustainability mean in the context of lunar exploration and development? As a sustainability scholar, space systems engineer, and planetary scientist, I've been exploring this question and the potential long-term consequences of these missions for the Moon itself.
The delicate lunar environment is surprisingly sensitive to human activity. Unlike Earth, the Moon has no biodiversity, climate, or oceans, but it does have an active environment. A single landing by a large modern spacecraft could disturb an area of the lunar surface two to five times larger than the Apollo missions did. Landings can also release water vapor, carbon dioxide, and other gases into the lunar exosphere, creating a temporary atmosphere. The cumulative effects of dozens of missions planned over the coming decade on the lunar environment are unknown, and whether they're reversible is a question that scientists are only beginning to explore.
The concept of sustainability on Earth balances protecting the environment, maintaining economic well-being, and caring for society, current and future generations. But what does sustainability mean on the Moon? A survey of people with an interest in space and lunar exploration revealed a diversity of perspectives. Space industry professionals tended to focus on financial and operational aspects, such as keeping missions affordable and developing the Moon's resources for a self-sustaining economy. Academics, on the other hand, related lunar sustainability to environmental and ethical concerns, with some opposing large-scale human activity on the Moon altogether.
The shared cultural significance of the Moon calls for conversations between various groups, from space agencies to communities living near rocket launch sites. The decisions made now will shape what the lunar surface looks like and what the Moon means to people for generations to come. Some of those decisions may be irreversible, and policymakers are only beginning to develop the governance frameworks needed to make collective decisions about lunar exploration and development.
In my opinion, the conversation about what sustainability means for lunar missions is becoming increasingly relevant as plans for lunar bases move forward. We need to carefully consider the environmental, economic, and ethical implications of these missions and work towards a balanced approach that protects the Moon's delicate environment while also supporting scientific exploration and potential commercial ventures. The Moon's future is in our hands, and we must make sure that we leave it in a better state than we found it.
