WMS2KML

Try now: Use one of the following urls and copy them into the input field:

http://data1-glues.ufz.de/geoserver/globcover/wms

http://data2-glues.ufz.de/thredds/wms/pik_wcrp_cmip3/miroc3_2_medres_sresa2_2006-2099_tmp.nc

Open the file in Google Earth (It might take a few seconds to load). If you choose a WMS with time variate data please notice that Google Earth cannot handle animated views for these services, but you can see each time step as image. For the GLUES Regions (first of the example services) it might look like this: