Why do we use themes?
The Atlas has been structured by theme, to aid users who might be interested in specific topics. The theme page provides a (brief) introduction, indicates partners, key documents, keywords for searching and links to the relevant data within the Atlas.
Certain subjects straddle more than one theme, of course. As a result, you may find a document or data source in more than one theme. This simply indicates how multi-dimensional certain topics are.