SOIL AS THE SOURCE OF OUR MATERIALS 69 



save from waste the soil materials out of which our food supply 

 can eventually be greatly increased. 



So far as the soil is concerned, we need not fear that the 

 earth will become uninhabitable for many centuries. The 

 pressure of the population, even if it becomes several times as 

 great as it has been in China or India, can be met by the 

 application of science and cooperative effort to the resources 

 now in sight. If there is to be starvation, it will not be 

 because the earth and the sun and the green plants fail us. 



