Fluorocarbon fishing lines are not made from chlorinated fluorocarbons (the stuff that wrecks the ozone layer). All plastics off-gas and require pollution control during manufacture. I don't think this is why fluorocarbon tippets cost 3-4x as much as standard monofilament.
ALL high quality modern monofilaments are copolymers. Even old standbys such as Maxima have been reformulated as copolymers. PTFE (also known as Teflon, Glide, and Gore-Tex) is commonly fused onto monofilaments to decrease friction and, more importantly, reduce water absorption which impacts line strength.
Raw fluorocarbon is inherently harder than monofilament, however, it is also more brittle and stiff. Early fluoro leaders had major problems with coil memory and knot strength. Modern fluoro leaders include softening agents that make them much easier to work with at the expense of reducing abrasion resistance. Modern monofilaments can be produced that are extremely abrasion resistant. Momoi "Marlin" and Mason "Rock" monofilaments are MORE abrasion resistant than most fluorocarbons out there. All lines are a compromise and just because the spool says "fluorocarbon" it does not necessarily mean the line is any more or less abrasion resistant than its monofilament cousin.