Journal Entry. Photo courtesy of JoelMontes, Flickr.
This photo is licensed under a Creative Commons Attribution-ShareAlike 2.0 Generic license: http://creativecommons.org/licenses/by-sa/2.0/deed.en.http://www.flickr.com/photos/joelmontes/4762384399/
Scientists have kept records of the weather for the last two hundred years. To learn what the climate was like before that, they might have read old diaries or journals. A farmer might have kept a journal about when he harvested his crops each year. Another person might have written in a diary about when trees bloomed in spring.
