Dispel Own Global Enchantment

[Lazy_Perfectionist]

As well, a global gets +5 to the resistance of dispelling for each level of magic above the minimum in the spell's primary path.

... There is one other, unreliable way to dispel. Cast more globals, and hope one of them unseats what you've cast.

You get a 1/5 chance of targeting the right global, and a 4/5 chance of not... If you've only got the one up, its worth trying. If, however, the other globals are all yours, its a likely waste of gems.