Gaia introduces the planeteers to a new ecovillain - Verminus scum and describes his plan to create acid rain by burning coal mixed with a special formula. Wheeler asks why burning coal can be a problem and Gaia goes over the production of acid rain from coal burning and how it can have drastic negative effects on the environment.
Dr. Blight revels on about her AI computer, MAL and how it has infiltrated the EPA's master computer, changing the status of every National Park into a toxic waste dump.
Bill Nye explains why it gets colder as one travels up through the atmosphere. He uses miniature replicas of a city and a mountain to support his explanation. Bill also briefly touches upon the lapse rate.
Phil walks us through the different layers of the atmosphere. He explains what we can expect to find at each layer and the concentration of air molecules at each level.