Could be good to use as a greenhouse with aquaculture like http://www.dailymail.co.uk/sciencetech/article-1158980/Frankenfarm-food-...

Good place to stick the CO2 too.

Sure, you can pmp the CO2 into a greenhouse, but it is simplier to send the precious plant food straight it in the atmosphere and use it as a transport medium for carbon distribution.

Consider it as a donation to poor African countries, which could use increase in crop yields. All of the earth agriculture benefited from the increase in atmospheric CO2 concentration occuring in the past century.