The experimental GeoInquiry search tool allows an instructional designer or advanced GeoInquiry user to search GeoInquiry maps and data for keywords (and optionally add that data to their own map). The tool includes all Esri produced geoinquiries but also state GeoInquiries content.
For example, a search for "climate" will search the metadata (including title and description) of about 150 maps and nearly 1,000 data services while ignoring all non-GeoInquiry content in ArcGIS Online.
The database behind the tool is updated twice monthly to reflect the latest changes in map and data service metadata. Explore the tool at http://edgis.org/geoinquirysearch