This is an interesting question, and there are two ways of answering: 1. which requires the least equipment to manufacture, or 2. which are the least popular, so they have less overall impact? I’ll answer #1, which you’re probably more interested in. Surfing comes to mind, because they require only swimsuits and a surfboard. Even less would be ocean swimming, but any pool sports are out, because drilling pools and keeping them chlorinated, etc. is not environmentally friendly. Biking is pretty low impact; lower than running, which generally requires a track to be laid. I’m probably missing some obvious ones, but there’s a start!
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