Polar bears in trouble / 
Rob Waring, series editor 
 - Australia :  Heinle, Cengage Learning,  2009 
 - 24 p. :  ill. ;  21 cm. 
 - Footprint reading library .
<br/><br/> "National geographic" - cover 
<br/><br/><label>ISBN: </label>142401112  B 
<br/><br/><label>Subjects--Topical Terms: </label><br/>English language -- Textbooks for foreign speakers<br/>Polar bears -- Climatic factors<br/>Global warming