Coal reserves

Here's some more info on where I found my info on coal reserves:

From the BP statistical review:

Total world reserves (as of 2006): 909064 million tonnes
Total world consumption: 3090.1 million tonnes oil equivalent

Conversion factors:
1 tonne oil equivalent = 1.5 tonnes hard coal (this is the conversion factor that I used)
1 tonne oil equivalent = 3 tonnes of lignite

So, total reserves ~ 606042 million tonnes oil equivalent

2006 reserves/2006 consumption = 196 years
Note: The 196 years is my calculation, BP says that there are currently 147 years left at current production, they must have used an average conversion factor of ~ 2 tonnes coal = 1 tonne oil equivalent or either that or production of coal is quite a bit larger than consumption of coal.

With the 2006 growth rate of coal of 4.5%, there is 51 years left.
Or, with the conservative estimate by the DOE of 1.8% growth rate (at least until 2030), there is 83 years left.