Myself, I'll start to be concerned when the earth is warmer than *ever*.
Meaning that I won't be worried when
date palms start springing up in Churchill because they've grown there before.
A more likely issue is as one climatologist theorized that the current warm period is an anomalous interlude in what should be a 500,000 year ice age and not just the aftermath of an ice age that only lasted 200,000 years.
He says that soon enough nature will be about the business of covering Canada in ice again.
Canada in 2100:
CKA Moderator 
