In this book, Aleksandr V. Bezgodov and Konstantin V. Barezhev formulate planetary ethics-the most important part of the philosophy of the Planetary Project. Planetary ethics represent the moral basis and value code for building a biocompatible, harmonious, and manageable civilization. They analyze the moral and ethical views of those Russian cosmists who belonged to the natural science branch of this unique philosophical, scientific, and cultural phenomenon. Looking at the world through the prism of a planetary-cosmic consciousness, cosmists developed a system of biocentric and humanistic values. Russian cosmism is a spiritual rebellion of life against chaos, death, and limitation. A combination of science, philosophy, poetry, and a certain utopianism extended on a universal scale makes Russian cosmism a prologue to the modern nonclassical, science-based worldview that emphasizes synergy and globalism. Back in the late nineteenth to early twentieth century, cosmists focused on a united humanity and the principles of a close relationship between man and the universe. This monograph lays the groundwork for the planetary ethics that originated in the philosophy of Russian cosmism. The monograph continues the series of books of the Planetary Project, Planetary Project: From Sustainable Development to Managed Harmony and Planetary Rent as an Instrument for Solving Global Problems.