[Answer] What triggers tree leaves to begin changing color in the fall?

Step 1 : Introduction to the question "What triggers tree leaves to begin changing color in the fall?"

...As warm summer days fade into fall, shorter days and longer nights give a signal to the trees to stop producing as much chlorophyll. Chlorophyll helps the trees’ leaves create energy during sunny days, but with shorter hours of daylight, the trees need a break to prepare for winter. Leaves change to different colors because of their chemical composition. The four main chemicals that cause this are chlorophyll (greens), xanthophylls (yellows), carotenoids (oranges), and anthocyanins (reds).

Step 2 : Answer to the question "What triggers tree leaves to begin changing color in the fall?"

A decrease in sunlight:

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