Green Sulfur Bacteria are a group of photosynthetic microorganisms that primarily thrive in anaerobic environments, such as deep-sea hydrothermal vents and sulfur-rich hot springs. They utilize light energy to convert carbon dioxide and hydrogen sulfide into organic compounds, a process known as photosynthesis. Unlike plants, they do not produce oxygen as a byproduct. These bacteria contain specialized pigments called bacteriochlorophylls, which allow them to capture light energy efficiently. They play a crucial role in the sulfur cycle, helping to recycle sulfur compounds in their ecosystems. Their unique metabolic processes contribute to the overall health of their environments.