The video explores why plants are green due to chlorophyll, which absorbs sunlight for energy. Despite being green, chlorophyll is inefficient at absorbing green light, reflecting it instead. Historical theories suggest that ancient purple organisms absorbed green light, leaving other wavelengths for chlorophyll. This rivalry may have led to the dominance of green plants. The video also questions why plants didn't evolve black leaves for better light absorption, suggesting nature's focus on 'good enough' solutions rather than perfection.

What new insight or understanding did you gain from this video?