What Makes Leaves Change Color Every Fall?
The reds and oranges of fall leaves show up when there's less sunlight to take advantage of.By Evan Thomas | October 18, 2016
You know it's fall when the leaves start to turn. But what causes this riot of color?
Deciduous leaves have four pigments year-round: green, yellow, orange and red.
Most of the time, they're green. The color comes from chlorophyll, which the trees use to photosynthesize.