afforestation vs deforestation

afforestation

noun
  • The act or process of creating a new forest where none had existed before, or reforestation of areas long deforested. 

deforestation

noun
  • The process of destroying a forest and replacing it with something else, especially with an agricultural system. 

  • A transformation to eliminate intermediate data structures within a program. 

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