After loading Google Earth choose the 'File' menu and 'Open'. Navigate to the folder with the tags and select the top and last .kmz file while holding down the shift key. The markers can take a few minutes to load.
Using Google Earth to view IPOL pollen sites gives you the option to measure distances between sites, view site altitudes, view latitude and longitude in digital degrees and read database number and publication from the site marker properties. The information also becomes visible as the mounse pointer hovers over a marker.