Why leaves change color in the fall

Leaves are green because they contain lots of chlorophyll, the molecule that is responsible for photosynthesis. Chlorophyll is green because it reflects the green wavelengths of sunlight. It absorbs the blue and red portions of the visible spectrum and uses the energy of those light waves to manufacture carbohydrates. But chlorophyll is not the only pigmented substance in a leaf. There are also yellow and/or orange colored molecules in a leaf. The orange color