What's the greenest alcoholic drink?

Booze has a mixed reputation and diverging prospects. On the one hand, its cost to the health and criminal justice services is estimated to be around £10bn a year. On the other, it is increasingly touted as a planet saver. Farmers in India have turned to using wine rather than agrichemicals to spray crops, while bio-ethanol, which can be used to power cars, is an alternative to oil. According to drinks manufacturers, the latter has sent the price of pure alcohol soaring.