Generally speaking, plastic is extremely difficult to decompose, and even small fragments are difficult to be degraded by the ecosystem, so the environmental damage caused by it is very serious. Recently scientists discovered that an insect called a wax insect can degrade polyethylene And it's extremely fast. If we use biotechnology to replicate waxworm-degraded polyethylene, it will help us effectively clean up plastic waste accumulated in landfills and the ocean. Which of the following, if true, does not support the above conclusion? ['the main component of plastic waste around the world is polyethylene.', 'wax insects can indeed damage the polymer chain of polyethylene plastics.', 'The environmental impact of polyethylene-degraded substances by wax insects is unclear.', 'Existing scientific and technological means can purify the enzyme that degrades polyethylene in wax insects.']