One possible explanation is that warmer temperatures lengthen the growing season of plants and thus the presence of chlorophyll in leaves, which gives them their green color. As temperatures cool and sunlight decreases, the amount of chlorophyll in the leaves diminishes, allowing other pigments like carotenoids and anthocyanin — which color leaves red, yellow, orange, and purple — to show up. Warmer temperatures suppress the expression of these colors, leading to much shorter autumn seasons as well as less vivid colors.
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