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101 ways you can help save the planet before you’re 12!
Joanne O'Sullivan 1st ed.. Lark Books, c2009 書
An inconvenient truth : the crisis of global warming
Al Gore Bloomsbury, 2007 書
Planetwatch
written by Martyn Bramwell ... [et al.] Rev. ed.. Dorling Kindersley, 2009 書
