252 



OUR USE OF THE LAND 



OUR RESOURCES 50 YEARS HENCE 



CONSUMED 



BITUMINOUS 

 COAL 



PETROL 

 EUM 



IRON 



COPPER 



LESS THAN 2% 



PHOSPHATES 



1 



LEFT IN THE GROUND 



Each symbol represents 20 per cent 



PICTORIAL STATISTICS, INC 



In terms of the life of a. nation, fifty years is not a long time. Nevertheless, 

 within the short period we will have exhausted our present \nown supply of two of 

 our most valuable minerals. We have two alternatives: we can loo\ for more or we 

 can try to use what we have with greater care. 



