The globe is very flush and does not have much area to grab. Here is a link to a photo. http://www.hamptonbay.com/Product.aspx?pid=2a23ce2c-5c68-44f8-b830-ddd98b797cdf&cid=791128
It is just stuck.
You put pressure on the glass and turn it. Careful not to break it.

from the looks of it i would call H-deopt, see if they can get you the info,
References :
maint man
You put pressure on the glass and turn it. Careful not to break it.
References :