What's an order of magnitude difference among friends?

Two market studies from last week:

• WinterGreen Research released a study which concludes that the market for "fuel cell components" will reach $100B by 2013. Up from an estimated $171M in 2004.
  

• Freedonia released a study which concludes that "world fuel cell demand" will reach $2.6B by 2009, and $13.6B by 2014.

Clearly there remains some significant uncertainty around the growth and adoption path for fuel cell technology...