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GIO inspects a few of environment variables in addition to the ones used by GLib.
XDG_DATA_HOME, XDG_DATA_DIRS. 
        GIO uses these environment variables to locate MIME information.
        For more information, see the Shared MIME-info Database
        and the Base Directory Specification.
      
GVFS_DISABLE_FUSE. 
        This variable can be set to keep Gvfs from starting the fuse backend,
        which may be unwanted or unnecessary in certain situations.
      
The following environment variables are only useful for debugging GIO itself or modules that it loads. They should not be set in a production environment.
GIO_USE_VFS. 
        This environment variable can be set to the name of a GVfs
        implementation to override the default for debugging purposes.
        The GVfs implementation for local files that is included in GIO
        has the name "local", the implementation in the gvfs module has
        the name "gvfs".
      
GIO_USE_VOLUME_MONITOR. 
        This variable can be set to the name of a GVolumeMonitor
        implementation to override the default for debugging purposes.
        The GVolumeMonitor implementation for local files that is included
        in GIO has the name "unix", the hal-based implementation in the
        gvfs module has the name "hal".
      
GIO_USE_URI_ASSOCIATION. 
        This variable can be set to the name of a GDesktopAppInfoLookup
        implementation to override the default for debugging purposes.
        GIO does not include a GDesktopAppInfoLookup implementation,
        the GConf-based implementation in the gvfs module has the name
        "gconf".
      
GVFS_INOTIFY_DIAG. 
        When this environment variable is set and GIO has been built
        with inotify support, a dump of diagnostic inotify information
        will be written every 20 seconds to a file named
        /tmp/gvfsdid..
      pid
GIO_EXTRA_MODULES. 
        When this environment variable is set to a path, or a set of
        paths separated by a colon, GIO will attempt to load
        modules from within the path.
      
GSETTINGS_BACKEND. 
        This variable can be set to the name of a GSettingsBackend
        implementation to override the default for debugging purposes.
        The keyfile-based implementation that is included in GIO has
        the name "keyfile", the one in dconf has the name "dconf-settings".
      
GSETTINGS_SCHEMA_DIR. 
        This variable can be set to the name of a directory that is
        considered in addition to the glib-2.0/schemas
        subdirectories of the XDG system data dirs when looking
        for compiled schemas for GSettings.
      
GSETTINGS_KEYFILE_BACKEND_STORE. 
        This variable can be set to the path where the keyfile GSettings
        backend stores its data. By default, the keyfile is stored in
        $HOME/.config/gsettings/store.