Were the moon teeming with life, that might be a concern, but we know with a reasonable degree of certainty that the moon is without life. It's unlikely that an

Were the moon teeming with life, that might be a concern, but we know with a reasonable degree of certainty that the moon is without life. It's unlikely that any life well-adapted to earth's environment will flourish on the moon without a support system, so there is little risk of harm to the moon's environment (or lack thereof).