I ran across a blip in a magazine and online about Honolulu’s new A/C venture. Downtown Honolulu is going to use deep, cold ocean water to cool its high rises and hotels. Hawaii has to import oil for much of its energy needs. Hawaii has incorporated solar into buildings for much of its energy use, but the demand for A/C by tourist is very high. This could reduce Honolulu’s energy use by 90%, which would mean saving over 174 million barrels of oil, which could equal 84,000 tons of carbon. We could all learn a little something from this kind of ingenuity.
This link gives specifics on how the system works.