(1992) have highlighted this fact by noting that carbon dioxide is the first molecular link between the atmosphere and biosphere, that it is essential for photosynthesis, which sustains plant life, the basis of the entire food chain, and that no substance is more pivotal for ecosystems, either natural or managed.
(1992; have highlighted; this fact) (no substance; is; more pivotal for ecosystems, either natural or managed) (ecosystems, either natural; managed; ) (it; is; essential for photosynthesis) (photosynthesis; sustains; plant life)
1992 no substance ecosystems, either natural it photosynthesis
have highlighted is managed is sustains
this fact
more pivotal for ecosystems, either natural or managed
essential for photosynthesis
plant life