THE EARTH FOR MANKIND 547 



Development of commerce (exchange of goods) 

 Advantages 



Makes possible fuller utilization of resources and conditions 



of each region 

 Makes possible specialization and development of skill 

 Disadvantages 



Makes necessary handling and transportation of more and 



more material 

 Makes every region or nation dependent upon many others 



5. The World War and national food problem 



Survey of food resources 

 Systematic control 



Of production 



Of distribution 

 Public education for all people 



On diet 



On production 



On preservation 

 Public realization 



Of dependence upon adequate food supply 



Of need for large-scale coordination and cooperation 



6. Conservation 



How to get the most out of our natural resources 

 How to get the most out of human labor 

 How to make best use of our materials 



QUESTIONS 



1. Of what advantage to any nation is a growing population? to the 

 race as a whole ? Of what disadvantage ? 



2. Is it desirable to increase the population of your community or 

 state ? Why ? Of the world ? Why ? 



3. Why do some states support more people per square mile than 

 others? Could the same density of population be maintained in all? 



4. What can be done to make possible large populations without un- 

 due crowding? 



5. What animals or plants would it be desirable to exterminate from 

 your region ? Why ? 



6. How could the extermination of an undesirable plant or animal 

 bring about undesirable consequences ? 



