By myself I can't move a mountain or change the direction of ocean currents. Together we move mountains and seas. In the seas with us now: changing oceanic thermocline, next up, new ocean currents. VERY, VERY, VERY BAD IDEA!!!
This graphic shows how the thermocline normally works in the South Pacific. The science of this does not belong here. It is sufficient to say that any permanent change to the normal state of the oceans will have enormous consequences for all life on Earth. We mostly can't easily see those changes, but we sure as heck should be paying attention.