conservation vs threat

conservation

noun
  • The discipline concerned with protection of biodiversity, the environment, and natural resources 

  • The protection and care of cultural heritage, including artwork and architecture, as well as historical and archaeological artifacts 

  • Wise use of natural resources. 

  • The act of preserving, guarding, or protecting; the keeping (of a thing) in a safe or entire state; preservation. 

  • Genes and associated characteristics of biological organisms that are unchanged by evolution, for example similar or identical nucleic acid sequences or proteins in different species descended from a common ancestor 

  • lack of change in a measurable property of an isolated physical system (conservation of energy, mass, momentum, electric charge, subatomic particles, and fundamental symmetries) 

threat

verb
  • To press; urge; compel. 

  • To use threats; act or speak menacingly; threaten. 

noun
  • A person or object that is regarded as a danger; a menace. 

  • An indication of potential or imminent danger. 

  • An expression of intent to injure or punish another. 

How often have the words conservation and threat occurred in a corpus of books? (source: Google Ngram Viewer )