After whales became scarce, elephant seals were hunted to the brink of extinction, primarily for their blubber, which was used for lamp oil. (marinemammalcenter.org)
I'm sure somewhere during that week the high priest's wife said something like «Honey, I know I just bought a new jug of lamp oil, but it's empty now. (religion.blogs.cnn.com)
Parts of foods that historically were disposed of, used for composting and considered waste or at best reserved for lower quality, utilitarian applications (like lamp oil) have suddenly become «food» through the alchemy of fossil fuel powered extraction and processing. (thehealthyhomeeconomist.com)