Estimate of total biomass is incorrect The page defines biomass as Biomass is organic non fossil material collectively In other words biomass describes the mass of all biological organisms dead or alive and then goes on to state The entire earth contains about 75 billion tons of biomass Assuming 1 billion is 10 9 this estimate is too low to be consistent with the definition To give an example in its Global Forest Resources Assessment 2000 the FAO estimates that the global total above ground woody biomass was 422 billion tonnes David Wardle