Is there any online service that allows to download only one thematic layer of the OSM data for a specific geographic region? For example all objects related to vegetation (trees, grassland,...), but not streets, railways etc. There must be an easy and straightforward way to do so (I hope?). I'd prefer to use the data directly in QGIS.
I am aware of Geofabrik which provides some data packages. But I am interested if there is any way to specify the data I want before actually downloading it?