Although the black-body spectrum of the sun does peak at green, that's not why plants are green. Consider this: they appear green to us because they are not ab

Although the black-body spectrum of the sun does peak at green, that's not why plants are green. Consider this: they appear green to us because they are not absorbing the green light. So, then, why green? For that matter, why not black? Apparently, there's some speculation that early microbes were purple, which meant that they absorbed the green light. Chlorophyll might have appeared only in later microbes, so it would have needed to absorb what was left; namely, red and blue light.