Why do Leaves Change color in the fall ?

Tree leaves contain a chemical called chlorophyll, which makes them look green in spring and summer. Chlorophyll helps capture light energy from the Sun and change it to a chemical form, like sugar, as food for the tree. The leaves also contain yellow and orange carotenoids (the substance that makes carrots orange), but THE GREEN Chlorophyll in spring and summer masks those other colors. In the fall, as days get shorter and colder, the chlorophyll breaks down and the yellow & orange show up . during the temperature falls below  45 degrees at night, sugar made during the day gets trapped in the leaves.This is what makes sugar maple leaves so it looks red.