Elizabeth May says global warming is saving us from a new ice age (and that's a bad thing?!)

In yesterday's debate (at about the 28 min mark), Green Party leader Elizabeth May argued that human induced global warming is preventing our entry into a new ice age.  In other words were it not for AGW, Canada would soon be looking at being buried under kilometer thick ice sheets. All life, all civilization, in Canada would be virtually wiped out! This would be an ecological Armageddon for Canada, would it not? 

So how can Elizabet May (Canada's Green Party leader) simultaneously argue that global warming is a bad thing, that Canada needs to take urgent action to stop it?