Sustainable clean cookstoves and biofuels for low-income households. By developing an end-to-end sugar beet bioethanol value chain, they ensured a vertically integrated fuel supply business model. This approach has reduced household cooking fuel budgets, displaced environmentally unsustainable wood fuels, and mitigated climate change drivers. Additionally, their initiatives have created jobs, generated income, and improved rural livelihoods. James Kariuki's work addresses both affordability and environmental sustainability, making a positive impact on low-income households and promoting a cleaner energy future.