This article evaluates the effectiveness of renewable energy sources compared to fossil-based energy, highlighting their potential to mitigate climate change and reduce greenhouse gas emissions. It explores the advancements in renewable energy adoption, including notable efforts in the United States and globally, such as Hawaii's ambitious plans and the rise in wind and solar energy capacity. Challenges such as infrastructure limitations, high costs, and political opposition are also examined, alongside the variability of renewable energy generation and battery storage limitations. The analysis underscores the urgent need for a global shift toward renewables while addressing the practical and systemic obstacles that hinder their widespread adoption.