Hot air trapped in the south, cold air circulates in north. This is exactly what Robert Felix predicts in his book NOT BY FIRE BUT BY ICE.
There is reasonable evidence to believe a magnetic excursion or reversal occurs every 12,000 years in synchronization with this shutdown. Is that what comes next?
In any event, the Holocene is over. That is a mouthful when you say it and you know why if you have been reading Vault-Co for any length of time.
UPDATE : It is so simple even British people could figure it out.