What is a waste product of photosynthesis?

The waste product of photosynthesis is oxygen. During photosynthesis, green plants and other photosynthetic organisms use sunlight, carbon dioxide, and water to create glucose (sugar) and oxygen. Oxygen is released into the atmosphere as a by-product of this process. While oxygen is essential to support life on Earth, too much of it can be harmful to some organisms. Additionally, excess oxygen in the atmosphere can lead to increased levels of ozone and other air pollutants. However, oxygen is not typically considered a traditional 'waste product' of photosynthesis as it is essential for many different organisms and processes.