. What's the cause of global warming, and what are the threats it poses? Explore the impact of global warming to life on Earth with easy-to-understand content tied to the curriculum of upper-elementary and middle school students and text written at a 2nd to 3rd grade reading level. Dyslexia-friendly font and design make learning accessible, and a recap at the end promotes checking for understanding to aid comprehension. It's key environmental science curriculum made approachable for all.