pollute vs refine

pollute

adj
  • Polluted; defiled. 

verb
  • To violate sexually; to debauch; to dishonour. 

  • To make something harmful, especially by the addition of some unwanted product. 

  • To make something or somewhere less suitable for some activity, especially by the introduction of some unnatural factor. 

  • To corrupt or profane 

refine

verb
  • To improve in accuracy, delicacy, or excellence. 

  • To become pure; to be cleared of impure matter. 

  • To purify of coarseness, vulgarity, inelegance, etc.; to polish. 

  • To make nice or subtle. 

  • To purify; reduce to a fine, unmixed, or pure state; to free from impurities. 

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