I'm not entirely sure that organic farming methods can feed 6, or 8 billion people. To feed that many people - the majority of whom live in congested urban population centres (I seem to recall reading that the UN now classifies over 50% of the global population as "city dwellers") - requires fairly efficient systems. Getting a city-full of fresh food into every city, every day is a task that should not be underestimated.
For cities of today's scale, I would argue that it is a process that requires a large degree of mechanisation and industrialisation. Organic farming should be practiced wherever possible (I'd like to think that goes without saying). But I'm not sure it's possible to feed the world that way.
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