See-oh-too is an influential guy. Trees Are Made of Gas teaches young readers all about carbon dioxide, an invisible, odorless gas that is essential for plant growth—but is also responsible for global climate change. Kids learn both the science and impact of the massive release of carbon dioxide into the atmosphere, making a clear argument for conservation and clean up. Providing simple explanations along with ways to reduce your own carbon footprint, this engaging book is sure to engage young environmentalists.