An interesting thing I learned a few years ago, don't remember where exactly, is that when people say things like, "We only have x years of material y left", wh

An interesting thing I learned a few years ago, don't remember where exactly, is that when people say things like, "We only have x years of material y left", what they are actually saying is that the known sources of that material will last for the next `y` years. There is almost always another way to get the raw materials, it just doesn't currently make sense to look for them because there are existing sources that are already available and meeting demand.