While vacationing on Cape Cod, best friends Emily, age sixteen, and Reese, seventeen, meet Steve and Dave, who seem too good to be true, and whose presence turns out to be related to a dire threat of global pollution.

Holly must solve the puzzle of an old legend if she and the other mermaids are to stop the toxic waste leaking from a wrecked ship, threatening a family of turtles living nearby, and get back to their vital mission for Queen Neptuna.

An oil spill spells trouble for Seaside Sanctuary and the birds and other marine animals that live along the beach, including a young pelican that Elsa and Olivia rescue; all the birds need to be carefully cleaned and given medical attention--but there is another problem: until the spill is cleaned up the birds cannot be released, and the company responsible for the spill does not seem interested in doing its part.

Hoping to transform a giant floating garbage patch into a habitable eighth continent where people can escape an oppressive bureaucracy, Evie and Rick must race against time when a plastic-obsessed villainess tries to claim the continent to expand her power.

When he has a dream about a future Earth devastated by pollution, Walter begins to understand the importance of taking care of the environment.

"A new kind of climate change story, narrated by an adorable axolotl who is--possibly--the last of its kind. . . . At the bottom of a lake in Mexico City, our axolotl narrator goes to underwater school, collects treasures tossed away by the big lugs on land, and has dance parties with tiger salamander friends. Life is good! But as the world gets hotter and hotter, the water gets murkier. Friends become harder to find, and the lonesome axolotl grows...

"There's an Earth Day celebration in store for Mrs. Green's class, and her students are working on important reports."--Publisher website.

"When a nearby mountaintop removal mine is suspected of contaminating the water and sickening the residents of a small Kentucky town, sixteen-year-old Liberty Briscoe searches for answers"--

"Earth spins through eons of time, and then one day humans arrive and they change the planet--and it continues to change today though not in a good way, but by working together we can save it, and ourselves."--

"The Aldens are bound for the Science and Hobby Fair, but when a bad storm hits, they're forced to stay in the bus station. Before they know it, the Boxcar Children are in the middle of a mystery involving a polluted river, two strange boys, and a bus ..." --