I just came across something called the Stop the Next Glaciation Project.
The link for it is here, its from M.A Vukcevic, a well known and respected solar scientists, not sure of his actual qualifications.
Anyhow, in my opinion nothing, and i mean nothing will stop us going into an ice age.
Stopping currents to let oceans not freeze will be fruitless, the onset has already begun.
We are dealing with a climate that cannot in any way shape of form be influenced by man.
Increases Co2 and burning every fossil fuel in the ground would be a gigantic waste of time.
Within a few decades, this will be clear IMO.
Heres the link.