Endangered species, energy hogs and mountains of garbage may sound like insurmountable grown-up problems to little people looking to make a difference on Earth Day.

Fear not. With save-the-planet buzz filling up their worlds, kids have a fresh crop of books that break down eco-issues into bite-size vocabulary lessons, simple reuse and recycle projects and easy ways to get inspired.

A sampler:

"What Can You Do with an Old Red Shoe?" (Henry Holt, $16.95, ages 4-7) by Anna Alter

With sweet rhymes about everyday discards, children learn from animal kids how to turn a worn-out shoe into a planter, an orphaned flip-flop into an art stamp and a torn T-shirt into a pillow. The projects have numbered steps. Some adult nail-pounding, sewing and cutting required.

"S is for Save the Planet" (Sleeping Bear Press, $17.95, ages 6-10) by Brad Herzog and illustrated by Linda Holt Ayriss

A how-to-be-green alphabet book that offers up C for carpooling, V for vermicomposting and X for xeriscaping — all adequately explained. Each letter is accompanied by chunkier text for older kids on how the planet came to be in shambles and how they can help save it.

"Insiders: Rain Forests" (Simon & Schuster, $16.99, ages 8-12) by Richard C. Vogt

Latest in the popular Insiders picture encyclopedia series, no rainforest plant or animal life form is left uninvestigated. It's stunningly illustrated and exhaustively researched but not terribly playful for kids who might need to be drawn into the subject.

"The Butterfly Ball and the Grasshopper's Feast" (Candlewick Press, $22.99, all ages) by William Plomer and illustrated by Alan Aldridge

A richly colored reissue of a 1973 British classic. Inspired by an 1807 poem from William Roscoe, Plomer's verse is perfectly wed to Aldridge's fantasy world of small animals and insects as they prepare to party. "When the guests began to dance/Even those who had no wings/Flew around, as if in a dream,/On feet like enchanted things." Nature notes by Richard Fitter.

"What's So Bad About Gasoline?" (HarperCollins, $5.99, ages 5-9) by Anne Rockwell and illustrated by Paul Meisel

A Stage 2 reader, the story of petroleum is told from a scientific standpoint. One point is made crystal clear to kids who may need a climate change primer: Gasoline is made from petroleum. Petroleum is a fossil fuel. Once it's gone, it'll take millions of years before even the promise of more can surface.

"101 Ways You Can Help Save the Planet Before You're 12!" (Sterling, $14.95, ages 6 and up) by Joanne O'Sullivan

Save dryer lint to stuff a pillow, or put it out for birds to use for nests. Find an eco-warrior hero, read up and allow yourself to be inspired. Throw a swap meet with friends to reuse what you'd normally throw away. A lively, nicely illustrated how-to on making a difference.

"Earth Day, Ready-to-Read" (Simon & Schuster, $3.99, ages 4-6) by Margaret McNamara and illustrated by Mike Gordon

This Level 1 reader focuses on a first grader up against some big ideas on how to save the earth. Eigen says he'll rescue polar bears, Katie vows to plant a forest and Michael declares he'll save the dolphins, but Emma chooses to pick up trash, ride her bike and brush her teeth without running the water.

"We are Extremely Very Good Recyclers" (Penguin, $16.99, ages 6-9), based on characters created by Lauren Child

Fans of the quirky "Charlie and Lola" books and cartoon series on Playhouse Disney won't be disappointed as the brother-sister twosome and their friends try to win a recycling contest. Little Lola's charm shines through, as do the collage-style illustrations. Poster for would-be recyclers included.

"Michael Recycle Meets Litterbug Doug" (Worthwhile Books, $15.99, ages 4-8) by Ellie Bethel and illustrated by Alexandra Colombo

Last year's green-caped crusader is back and the eco-war is on. This time, the villain is a slovenly boy with a gnawed apple necklace and only rats as friends. Litterbug Doug lives on a mountain of garbage on the edge of town until Michael works his magic. Large, colorful illustrations perfect for readalouds.

"The Adventures of a Plastic Bottle" (Simon & Schuster, $3.99, ages 4-6) by Alison Inches and illustrated by Pete Whitehead

A very, very happy glob of crude oil keeps a diary of his journey through the manufacturing chain. He becomes a bottle of water then gets shredded, heated and extruded at a recycling plant to be reborn as synthetic fleece fit for an astronaut. Includes an age-appropriate glossary.

"Earth in the Hot Seat, Bulletins from a Warming World" (National Geographic, $19.95, ages 9-12) by Marfe Ferguson Delano

You can't go wrong with a cover featuring a polar bear clinging to a tiny chunk of ice in a vast and lonely sea. Ravaged rainforest in Borneo. A once-flat bike path left buckled and bumpy by melting permafrost near Fairbanks, Alaska. Huge white blankets spread over a depleted glacier in Austria. This is a sweeping look at climate change for kids, yet not too technical.