leaf litter vs recycle bin

leaf litter

noun
  • Dead plant material, such as fallen leaves, bark, and twigs, that has fallen to the ground and may be used by animals as habitat or for nest-building, eventually decomposing and releasing nutrients into the soil. 

recycle bin

noun
  • A container in which items to be recycled may be placed. 

  • In Microsoft Windows, a storage location for deleted files, from which they can be retrieved or permanently deleted. 

How often have the words leaf litter and recycle bin occurred in a corpus of books? (source: Google Ngram Viewer )