Oceanographer: To substantially reduce the amount of carbon dioxide in Earth' s atmosphere, carbon dioxide should be captured and pumped deep into the oceans, where it would dissolve. The cool, dense water in ocean depths takes centuries to mix with the warmer water near the surface
any carbon dioxide pumped deep into oceans would be trapped there for centuries.
Carbon dioxide will dissolve much more thoroughly if it is pumped into cold water than it will if it is pumped into warmer water.