When he has a dream about a future Earth devastated by pollution, Walter begins to understand the importance of taking care of the environment.
Editions · 5
Paperback
1990 · Houghton Mifflin
48 pp · EN
9780395533086
Paperback
1992 · Penguin Random House
EN
9780224032988
Paperback
1992 · Cape
32 pp · EN
9780224030595
Paperback
2011 · Sandpiper
EN
9780547520261
Paperback
2015 · Houghton Mifflin Harcourt Publishing Company
48 pp · EN
9780547528427
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