Correction to my post #9004557 27/01/2013:
Paragraph 7 line 2 should read: 2.8 Mil tonnes p.a.(not 2.8 bil)
Friends!! This is what happens when you drink good red @ 2am.
Now: ABU, and the half dozen others, you have an extra day to complete this research challenge.
Cheers
Huckle