Photosyntheis, notice what the focus is
Photosynthesis is the process in which plants convert sunlight into sugar. The focus of photosynthesis is on the sun so Wale might possibly be comparing himself to the sun
In reference to the previous line, photosynthesis is the process by which autumn leaves change color.
To help improve the meaning of these lyrics, visit "DC Gorillaz" by Wale Lyrics and leave a comment on the lyrics box