The green color in leaves and blades of grass comes from a pigment called chlorophyll, which absorbs sunlight during photosynthesis, one of the most important natural processes on Earth. During photosynthesis, plants and trees use sunlight to convert carbon dioxide in the air and water into energy-rich sugars for food. That’s why leaves are at their most lush and greenest during the summer months, when the longer sunlight hours kick photosynthesis into overdrive. One bonus product of the process is oxygen, which is essential for life. In other words, most life on Earth is solar powered.
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