3 links have been added on this idea.
  1. These nanites can break down microplastics into CO2 and water. So maybe there is hope for our planet yet!
    https://www.pbs.org/newshour/science/this-new-nanotech-could-help-clean-up-earths-microplastics

  2. It will take several lifetimes for all of earth’s plastic waste to decompose, when not accounting for new plastics being produced every day. Nanites that can decompose plastics can help save us from this impending doom!
    https://ourworldindata.org/plastic-pollution