Eurasia is a big place.  "Climate and society" is a big topic.  "Past, present, future" is a long time.  How can a researcher get a grasp of all the many resources that are available to them?  How can they focus in on the best resources for the particular region, time period, and issues they are exploring?  No guide can cover every possible resource, but this one will start you down the road toward the databases, bibliographies, digital libraries, periodical publications, indexes, catalogs, archival guides, and other tools you will need to identify high-quality primary, secondary, and tertiary sources on your topic.