"We know that, on average, each tree absorbs from 13 to 48 pounds of carbon dioxide per year. We have planted 15 trees. How much carbon dioxide absorption will the trees we’ve already planted enable in the next 50 years?" Five math problems with an environmental theme.
Rather than focusing on text, this lesson addresses Chris Van Allsburg's use of light and shadow to tell a dystopian fairy tale... but it was surely just a dream. This is a great art appreciation lesson.