"A call to eco-action based on the power of numbers ... Young readers marching in step will meet Greta Thunberg and other iconic environmentalists and glimpse multiple ways of participating in the movement – Kirkus ReviewsIt starts with one small step, one small action, And grows... and grows... To BILLLIONS fighting for BIG changes Learn how a movement builds from one person to a billion in this A to Z environmental activism book. Readers count from 1 to 10 -- and then in larger increments to a billion -- as they learn new terms from "convervation" to "activism" and discover ways they can take action to protect the planet. A counting and A to Z book Boxes on each page provide easy-to-understand definitions of additional new vocabulary words Endnotes go into more detail about the activist featured in the book and ways readers can help make a difference towards climate change