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<iframe name="ngram_chart" src="https://books.google.com/ngrams/interactive_chart?content=paleolimnology,acid+rain,eutrophication,climate+change,lake+sediments&year_start=1960&year_end=2008&corpus=15&smoothing=3&share=&direct_url=t1;,paleolimnology;,c0;.t1;,acid%20rain;,c0;.t1;,eutrophication;,c0;.t1;,climate%20change;,c0;.t1;,lake%20sediments;,c0" width=900 height=500 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></iframe>
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cook_VERB, _DET_ President _PROPN_
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1960
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2008
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English (2012)
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English
2012
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paleolimnology
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1960 - 1974
1975 - 2000
2001
2002 - 2004
2005 - 2008
English
acid rain
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1960 - 1984
1985 - 1993
1994 - 1995
1996 - 2005
2006 - 2008
English
eutrophication
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1960 - 1973
1974 - 1990
1991 - 1993
1994 - 2005
2006 - 2008
English
climate change
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1960 - 1992
1993 - 2005
2006
2007
2008
English
lake sediments
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1960 - 1970
1971 - 1982
1983 - 1985
1986 - 2003
2004 - 2008
English