Treehugger has two interesting posts that are well worth looking at. The first concerns Japan Airlines (the world's second largest airline) experimenting with and finding biofuel based on a combination of jatropha, algae and camelina oil more efficient in jets than fossil fuels. While these do still put carbon into the air, the reduced amounts of pollution from increased efficiency must be lauded. And, all three of these crops grow in India. Check the post out at: http://www.treehugger.com/files/2009/01/japan-airlines-finds-biofuel-more-efficient-than-petro-fuel-in-test-flight.php
The second post deals with a traditional Japanese farming practice including vegetable and rice cultivation called Satoyama: http://www.treehugger.com/files/2009/01/satoyama-japan-mountain-farms.php Funnily, modern Japanese rice cultivation methods which involve the heavy use of fertilizers are not really more efficient. I guess there is a lot of sense in using the old ways as far as agriculture is concerned.
Both of these posts have a relevance to South Asia. India in particular has taken to jatropha cultivation in a big way and there is a lot of potential for algae cultivation in filthy sewage carrying canals like Chennai's Cooum "River" and similar outlets in other cities. Instead of merely rotting and stinking the place up, India's shit could literally provide a valuable resource to help people fly. It would also reduce the amount of money that the country sends out to Abdullah land for buying jet fuel. Good idea? You bet!