918
Models indicate that solar and volcanic forcings can explain periods of relative warmth and cold between AD " 1000 and 1900 , but human-induced forcings are needed to reproduce the late-20 th century warming .
 time: AD
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 time: AD