Because of human actions, the climate is changing-and not for the better. So argues Otto, whose work is at the forefront of climate science.Whatever else we might know, or think we know, about the climate, "every weather event takes place under different environmental conditions than those of 250 years ago," writes Otto, director of Oxford University's Environmental Change Institute. Unpacking that, the 250-year cutoff roughly coincides with King George III's awarding of a patent to James Watt for the steam engine, which would soon give birth to the Industrial Revolution-and with it the greenhouse gases that are steadily warming the atmosphere. Commanding a vast body of data, Otto observes that the "seven hottest years [in recorded history] have all taken place within the last decade." Because we are in the middle of this change, we suffer from observational bias: We know it's hot, but we keep at our normal affairs. Meanwhile, this rising heat has different effects in different places. More heat means more atmospheric moisture but also quicker evaporation, so that some places will be flooded and others will suffer from drought. The big-picture effects are predictable, writes the author, but we must look beyond those "large-scale averages" to consider the effects of climate change on a storm-by-storm, drought-by-drought basis. Throughout the narrative, Otto intersperses glimpses of that big picture with a major case study: Hurricane Harvey, which in 2017 did nearly as much damage as Hurricane Katrina a dozen years earlier, dropping 41 inches of rain in just three days. Along the way, the author considers the concurrent effects of leaders of government and industry who have stymied research. She has an answer: "If governments don't do their job and don't do enough to put a stop to climate change, then courts can remind them of their purpose."Those who doubt the severity of climate change will persist, but for the fact-minded, Otto's arguments are incontrovertible.