No metal, no hard edge, no sparks, no industry. We're talking all softness, first. Pollution is bad why, because it kills. That's why we know we have to prevent it, because it's deadly. It kills first other species, and we know therefore we will eventually follow.
Pollution is violence.
Therefore, Ahimsa supports a return to Virgo, Kanya, the state of innocence, before any exploitation penetrates and spoils the pure womb that gives birth to all new and fresh things. Earth should always be respected as a Kanya Kumari, a virgin, a girl to be respected. Pacifism is the unspoken first law of the spiritual world. There is no pain infliction there, no conscious exploitation, only conscious service and conscious giving in love and appreciation, no anxiety, no worries. Like imagine a deer walking up to you asking for drink of water because he has no hands and the well is deep.