Reflected light. The environmental concerns of lunar mining would be dominated by the effects of massively scaling up the space industry on Earth. Distantly beh

Reflected light. The environmental concerns of lunar mining would be dominated by the effects of massively scaling up the space industry on Earth. Distantly behind that would be the potential for changing how reflective the moon is. Changing the gravitational pull is just beyond consideration. You'll be able to take a train to the moon before that's a problem.