With critics skeptical, company looks to test 'green thumb' in deep blue sea.  A small California company is planning to mix up to 80 tons of iron particles into the Pacific Ocean 350 miles west of the Galapagos islands to see whether it can make a splash in the markets where people seek to offset their greenhouse gas emissions.  Planktos -- with 24 employees, a Web site and virtually no revenue -- has raised money to send a 115-foot boat called the Weatherbird II on a voyage to stimulate the growth of plankton that could boost the ocean's ability to absorb carbon dioxide from the air. The company plans to estimate the amount of carbon dioxide captured and sell it on the nascent carbon-trading markets.

http://www.washingtonpost.com/wp-dyn/content/article/2007/07/19/AR2007071902553.html