“Leaves are green to begin with because they make chlorophyll, and what chlorophyll does is it turns CO2 into the oxygen that we love and the sugar that they need to survive. Once the days start getting shorter and the temperatures start to cool down, they stop that chlorophyll production. And what happens is then that green pigment breaks down, and the oranges and yellows that have been there the whole time – we can actually see them.” - Stephanie Spera