Google Books Ngram Viewer

Graph these comma-separated phrases:
case-insensitive
between and from the corpus with smoothing of .  
Search in Google Books:

1950 - 1990 1991 - 1996 1997 1998 1999 - 2000 global warming English
1950 - 1989 1990 - 1996 1997 1998 1999 - 2000 climate change English
1950 - 1978 1979 - 1996 1997 1998 1999 - 2000 global cooling English

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