The complete text of Laudato Si', the landmark encyclical letter from Pope Francis that, as Time magazine reported, "rocked the international community" In the Encyclical on Climate Change and Inequality, the beloved Pope exhorts the world to combat environmental degradation and its impact on the poor. In a stirring, clarion call that is not merely aimed at Catholic readers but rather at a wide, lay audience, the Pope cites the overwhelming scientific evidence of climate change, and does not hesitate to detail how it is the result of a historic level of unequal distribution of wealth. It is, in short, as the New York Times labeled it, "An urgent call to action . . . intended to persuade followers around the world to change their behavior, in hopes of protecting a fragile planet." With an insightful and informative introduction by Harvard professor Naomi Oreskes, famed for her bestselling Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Global Warming.