For this reason green plants form the starting point of nearly every ecosystem, natural or "man-made", present or past, and the subsequent fate of the chemical energy thus "fixed" is therefore of considerable importance.
(green plants; form; the starting point of nearly every ecosystem, natural or "man-made", present or past, and the subsequent fate of the chemical energy thus "fixed) (the subsequent fate of the chemical energy; thus fixed; )
green plants the subsequent fate of the chemical energy
form thus fixed
the starting point of nearly every ecosystem, natural or "man-made", present or past, and the subsequent fate of the chemical energy thus "fixed