What is humanity's greatest challenge? 
Roman Espejo, book editor 
 - Detroit  Greenhaven Press  c2010 
 - 108 p. ; 24 cm. 
<br/><br/> Includes bibliographical references and index 
<br/><br/><label>ISBN: </label>9780737743142 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Humanity - Juvenile literature<br/>Social problems - Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>306.09045 ESP