good link ... the 'thc' goes all around the world and if i remember correctly can take 10 to 100 years to make the circuit ..... barring bungling interferences.
http://en.wikipedia.org/wiki/Thermohaline_circulation
whoops .... it says the oldest waters may take 1600 years for a round trip!
re drano .... right you are. i do prep experiments and tests all the time ... and the battery conversions are leading to the probable metro conversion / hybridization. i'm less interested in producing more power in a given engine ..... prefer long life. i've been convinced for 40 years ..... hydrogen in the pipes v nat gas sounds like a good plan. compressed air / liquid air, flywheels, springs, etc .... all appeal to me.
for the curious ..... here are some very early 20th cent electric tractors .... amazing what we've done.
http://www.bungartz.nl/elektra.html