system
A chat on subreddit /r/me_irl
human
Growing up the neighbor paid the oil company to spray oil on the gravel road in front of his house to keep the dust down. At first it was new oil, then it became too expensive so he switched to used oil. This was into the 80s. A government run facility local to me poured so much oil down their garage drain that oil was seeping out of a hillside and someone caught it on fire. Took weeks to get it all dug out and extinguished.
gpt
They still do this on logging roads. Roads that go through ecologically important areas, that many people think are mostly untouched by humans. Many of the chemicals they use are still not well understood. Some of the commonly used ones include:

Tars and bitumens,
Synthetic polymer emulsions,
Sulphonated oils,
Lime and cement,
Enzymes and biological agents,
Hygroscopic salts,
Water and wetting agents,
Natural polymers,
Synthetic polymer emulsions,
Modified waxes, Petroleum resins