I think trying to identify evolutionary motivation is generally risky and subject to all kinds of human biases. Any hypothesis is unfalsifiable (so, it's specul

I think trying to identify evolutionary motivation is generally risky and subject to all kinds of human biases. Any hypothesis is unfalsifiable (so, it's speculation, not science). Having said that, "Green = provides a convenient way for animals to identify a great source of energy" is likely to be one driver here.