Virtually all the acetylene distributed for welding and cutting use is created by allowing calcium carbide (a man made product) to react with water.
The nice thing about the calcium carbide method of producing acetylene is that it can be done on almost any scale desired. Placed in tightly-sealed cans, calcium carbide keeps indefinitely. For years, miners’ lamps produced acetylene by adding water, a drop at a time, to lumps of carbide.
Before acetylene in cylinders became available in almost every community of appreciable size produced their own gas from calcium carbide.