Leaves transitioning from red to green

Quick answer：

This refers to the natural phenomenon where leaves change color in the autumn season. As daylight decreases and temperatures drop, chlorophyll, the pigment responsible for green color, breaks down, revealing other pigments such as carotenoids and anthocyanins, which give the leaves their red and yellow hues. This process typically begins with red hues and transitions to green as chlorophyll production resumes in the spring.