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Current technology exists to reduce the ship engine CO2 emissions
by the equivalent of 10-35% using giant kites.  This technology is
offered by the European company SkySails.

http://www.skysails.info/index.php?id=472&L=2

"Currently, SkySails is offering towing kite propulsion systems
for cargo vessels with an effective load of between 8 and 32 tons.
The planned product program comprises towing kite propulsion
systems with an effective load of up to 130 tons."

A California based company, not as far along in developing this
technology, is Kite Ship.

http://www.kiteship.com/news.php

Shipping companies investing in this technolgy are able to see a
positive rate of return on their investment.

A GHG control measure should be developed that requires large
ships entering California ports to have used this technology in
their travels here.  The CO2 emissions reductions could be very
large even if the emission reductions are only 10%.