Final answer:
Without specific data, it can't be definitively answered which region had the greatest increase in organic producers from 2005 to 2008, but North America and Europe have experienced significant growth in organic markets.
Step-by-step explanation:
The question asks which region saw the greatest increase in the number of organic producers from 2005 to 2008. While the student question does not provide the specific data required to answer this directly, we can deduce that the rise in organic food markets has been a global trend with many countries establishing government-regulated certifications.
Given the information provided, a tutor would not be able to provide a definitive answer on which specific region had the greatest increase without additional data. However, we do know that areas such as North America and Europe have seen substantial growth in organic food production due to market demand and regulation.
It is crucial for the student to access the specific data on organic producers' growth by region to answer this query accurately.