Discover how the Earth's atmosphere affects our climates, learn about weird weather across the world, and find out how the greenhouse effect is changing our weather. The 30 Seconds series takes readers on a journey of discovery through a wide range of fascinating subjects. Each topic is presented with a quick 30-second soundbite, supported by flash summaries and full-color artwork. Fun, interactive missions with things to make or do support the topics, encouraging readers to test, explore, and discover even more.