The Sierra Club has this to say about it:
Families Organized to Represent the Coal Economy, a coal-industry association that ironically does not permit families to join, recently released a coloring book for children teaching them the basics about coal energy. Enter Power Rock and his sidekick Spurt, superheroes with lumps of coal for heads.
To make a moronic story short, Power Rock sings the praises of coal energy, reminding kids that without coal they wouldn’t be able to play videos games or cruise the internet. Of course, he forgets to mention that coal is unsustainable, incapable of being clean, and continues to be a major contributor to climate change -- but these are just pesky little details probably too difficult to color.
Go download it now! Also makes a great holiday gift!
Originally, from this article on Grist, Coal coloring book teaches kids about dirty energy.