The Lorax by Dr. Seuss

When Dr. Seuss gets serious, you know it must be important.  Published in 1971, and perhaps inspired by the "save our planet" mindset of the 1960s, The Lorax is an ecological warning that still rings true today amidst the dangers of clear-cutting, pollution, and disregard for the earth's environment.  In The Lorax, we find what we've come to expect from the illustrious doctor: brilliantly whimsical rhymes, delightfully original creatures, and weirdly undulating illustrations.  But here there is also something more--a powerful message that Seuss implores both adults and children to heed.