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Instead , the Dunde ice - core record shows increasing temperatures from 1900 through the early 1950s , decreasing temperatures from the late 1950s through the mid-1970s , then higher temperatures again through last year .
 Dunde, 1900 through the early 1950s, the late 1950s through the mid-1970s, last year
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 Dunde, 1900 through the early 1950s, the late 1950s through the mid-1970s, last year