The Deep Carbon Observatory (DCO), led by Robinson Professor of Earth Sciences Robert Hazen, has released a landmark book recounting their findings over the past three years and their plans for the future. The DCO is a 10-year, $500 million project investigating Earth’s deep carbon cycle. The book was released open access online as part of the series Reviews in Mineralogy and Geochemistry. Professor Hazen was the lead editor of this volume. To read media coverage about the book, click here, here, here and here.