Jumbo is the second of five books in a dystopian catastrophic anthropogenic satirical novel series. In Book 1, "Proxy", levee failure has destroyed the home of Duncan and Iolanda Mellon. The two climate activists are missing and presumed dead, but their signatures are needed to unlock millions of dollars of carbon sequestration funds in the state's carbon account. Rev. James Stonecaster, pastor of the church of carbon redemption, and Henry Walden, Climate International's technical representative, try to access the account. Climintern builds Jumbo, a powerful global climate modeling computer, powered by renewable energy from a desert solar thermal power facility located on a flood-prone alluvial fan. A mysterious hacker provides Climintern with the code to enable Jumbo to control the world's digital thermometers to protect the hockey stick myth in the face of global temperatures failing to warm according to climate theory. Climintern's increasingly poor global warming temperature predictions are blamed on missing heat hiding in the abyssal ocean. The skeptic team launches an oceanographic expedition to debunk the hidden heat excuse. The team leader's pocket mercury thermometer, one of the few remaining after Climintern's mandatory buyback of thermometers not controlled by Jumbo, saves the day. Climintern tries to use Jumbo's computational power to discredit Dorothea Gauss and the skeptics, but her old temperature book repeatedly wins the challenges. On the alluvial fan, the fate of the solar thermal power facility is determined by desert varnish and flow path uncertainty.