Comprehensive resource summarizing current approaches to generating hydrogen from water and reducing CO2 into various hydrocarbons Green Energy Harvesting: Materials for Hydrogen Generation and Carbon Dioxide Reduction provides an in-depth treatment of the subject by exploring the fundamentals required for the selection of the materials, their synthesis methods, and possible ways to modify them for higher efficiency and enhanced stability. The prospects of adopting these sustainable solutions at a commercial level are summarized. Special emphasis is given to the figure-of-merits for currently developed systems for hydrogen generation and CO2 reduction and to an assessment of available materials in terms of efficacy and efficiency. Green Energy Harvesting also includes information on: Renewable energy in general, including the role of renewable hydrogen and hydrocarbon fuels, and possible renewable energy sources A fundamental understanding hydrogen generation and CO2 reduction Device development and deployment status for commercial usage and applications of H2 and hydrocarbon fuels in various sectors Electrocatalysts, 2D materials, and hybrid materials for CO2 reduction and H2 generation Green Energy Harvesting is a highly useful guide for both novice and experienced researchers involved in renewable energy and carbon dioxide utilization that explains the current state of the field and discusses future perspectives.