A very readable primer aimed at the general public on what is now known about past climate change and how scientists have determined this. In covering this Turney introduces us to many of the pivotal figures that over the centuries have contributed to our knowledge and understanding. Ice Mud and Blood covers the history of the science as well as the science of climate change. The book covers `snowball earth', why earth cooled since the time of the dinosaurs, the discovery of ice ages and the mechanisms that caused them, changes to earths' climate (when the Sahara was green, Medieval Warm Period, Little Ice Age etc) since the end of the last ice age up until present; the roles played by the oceans, ocean currents, volcanoes, tectonic plates, astronomical (Milankovitch) cycles and much else besides. Importantly the author also describes in an easy to understand way how scientists arrived at their findings and conclusions. Turney also explains the role of CO2 and why the current scientific consensus is that higher levels of greenhouse gases will raise earth's temperature with corresponding shifts to climate and weather. One lesson from human history is that we should be asking the question "will climate change mean things get wetter or dryer where I live?" Extremes of climate can have profound effects on human society's ability to support itself. This book is worth reading alongside Brian Fagan, William Boroughs and other writers in this field.