The Greenhouse effect :  causes and consequences  [including Can polar bears tread water?] / 
David R. Wright oin assoc. with WWF, Central Independent Television and Television Trust for the Environment. 
 - London :  Hodder and Stoughton,  c1990. 
 - 1 VHS videocass.(30 min.) :  plus 1 resource book and 1 teacher's guide. 
<br/><br/>Contents: 1 VHS cassette (30 min.) plus 1 resource book and a teacher's guide. 
<br/><br/> Junior high school through college students. 
<br/><br/><label>ISBN: </label>0340524235 034052423S 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Greenhouse effect, Atmospheric--Study guides.<br/>Global warming--Handbooks, manuals, etc.<br/>Global warming--Study guides.<br/>Natural disasters--History--Study and teaching.