 Welcome to Geobiology. Geobiology is the study of how earth and life interact and change each other. So earth provides the boundary conditions for life, it provides the resources for life to exist. And life performs reactions, organic chemistry reactions that use those resources and change earth. The surface of the earth is really shaped by the life that's on it. And as life has evolved through time, it has changed the surface of earth through time. And that again feeds back into the life that can exist and where it can exist. So geobiology is really the study of the planet earth, the life on it and how the two interact through time. So in the course of these lectures, we're going to cover a lot of different concepts. We're going to start with the idea of feedbacks between earth and life and then talk a lot about the different types of interactions different species have with each other that helps shape ecosystems and really structures that interaction between planet earth and life. From there, we'll go into more detail about what life is, what it needs and the life that's specific to what we know on earth. And in that particular case, we'll be talking about genetics and enzymes and how life evolves through time by the selection of the function of those enzymes and other components of life that's determined by the genetics. Then we'll get back to those interactions between different species and life in talking about ecology. And then we will come back and really talk about some of the details of how life and earth have interacted through time and continue to do so today. So I'm really looking forward to sharing this information with you. And it's one of my favorite topics that's something I've devoted my career to. And it's always wonderful to share what I've learned. And I hope you enjoy it. Thanks for watching.