Without plants we would die. They are solely responsible for converting sunlight into sugars, the basis for the beginning of the food chain. We rely on them to purify our air and enrich it with oxygen as well as absorbing carbodioxide from the atmosphere. The relationship between humans and plants is wonderfully interwoven as can be seen by the close symmetry between chlorophyll and haemoglobin.
The green molecule is the chlorophyll with magnesium its central atom and the haemoglobin with iron as its central atom.
This relationship intimate relationship man has with plants is touched on in Genisis 1: 29 30 “Behold, I have given you every plant yielding seed that is on the face of all the earth, and every tree with seed in its fruit. You shall have them for food. And to every beast of the earth and to every bird of the heavens and to everything that creeps on the earth, everything that has the breath of life, I have given every green plant for food.”