This article just presents a life cycle of carbon in which carbon is taken by plant to give carbohydrates which help in making protein, our skin and body uses proteins. Carbon is all over in us. The article just uses following key points taken from reference links given in Reference Section at end.
This is to show–how carbon taken and consumed by plants makes us. I hope you have understood what it means for climate change. Carbon is needed by plants to make and give us what we are made of——— cells, muscles all need carbon. So why not convert it back. To help us make better things. And keep recycling the things back and fro. Key thing is balance. How much carbon need to be in atmosphere.
We all need energy to work—where does it come from ?–carbon dioxide taken by plant + sunlight ———> gives us carbohydrates—a fuel humans need to do work. Apart from that we need proteins, which are made by plants — Manufacturing of artificial protein is not that easy as is shown in this article.
Bones perhaps dont have carbon and hence—even million year old bones of dinosaurs are found even today as it is.
This is not so with carbon. Plants can change the form of carbon from carbon di-oxide to protein , carbohydrates, and so many things we need—so many
Natural Rubber as given below has carbon and hydrogen and it can replace plastics–It can !
So –why hate carbon
Use carbon!
Here is the flowchart for you:
- Carbon di-oxide used by plants———
- Carbohydrates, proteins, nutrients, rubber, jute made by plants -These things are made by plants effortlessly
- consumed by humans in various forms not just food
- These things are disposed off in right way back to form of co2 needed by plant
We need to maintain this cycle to preserve the climate——
As per reference [1]
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that, through cellular respiration, can later be released to fuel the organism’s activities.
This chemical energy is stored in carbohydrate molecules, such as sugars and starches, which are synthesized from carbon dioxide and water.
As per reference [3]
A carbohydrate is a biomolecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen–oxygen atom ratio of 2:1 (as in water) and thus with the empirical formula Cm(H2O)n (where m may or may not be different from n) .
Here is what happens in plants when they take in co2 = carbon di-oxide. Equation taken from [1]

Here is the pictorial view given in [1]

In [3] the following diagram can explain you what we get from carbohydrate made by plants:

Human Muscles as per [6] is made up of:
Muscle Biochemical Composition Skeletal muscles contain approximately 75% water, 20% protein, 1–10% fat, and 1% glycogen.
Protein as per [7] made of–
Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, responding to stimuli, providing structure to cells and organism
as per [8] has following structure

Carbohydrates, proteins, nutrients, rubber, jute made by plants -These things are made by plants effortlessly. However the following describes how these are made in industry—
Carboxylic Group as per [9]
Carboxylic acid, any of a class of organic compounds in which a carbon (C) atom is bonded to an oxygen (O) atom by a double bond and to a hydroxyl group (―OH) by a single bond. A fourth bond links the carbon atom to a hydrogen (H) atom or to some other univalent combining group.

Carboxylic acids occur widely in nature. The fatty acids are components of glycerides, which in turn are components of fat. Hydroxyl acids, such as lactic acid (found in sour-milk products) and citric acid (found in citrus fruits), and many keto acids are important metabolic products that exist in most living cells. Proteins are made up of amino acids, which also contain carboxyl groups.

How are COOH Group formed–an example- As per [10]
Alkenes are oxidized to acids by heating them

Alkenes——-as per [11] it is formed as:
Alkenes are generally prepared through β elimination reactions, in which two atoms on adjacent carbon atoms are removed, resulting in the formation of a double bond.

In chemistry, alcohol is an organic compound that carries at least one hydroxylfunctional group (−OH) bound to a saturatedcarbon atom.[2]
Natural Rubber has Carbon- It can replace plastics

Human Bones as per [4] made of–No carbon—calcium.
Bone is a heterogeneous composite material consisting, in decreasing order, of a mineral phase, hydroxyapatite (Ca10(PO4)6(OH)2). The major minerals of the intercellular composite are calcium and phosphate. [5]
Carboxylic acid, any of a class of organic compounds in which a carbon (C) atom is bonded to an oxygen (O) atom by a double bond and to a hydroxyl group (―OH) by a single bond. A fourth bond links the carbon atom to a hydrogen (H) atom or to some other univalent combining group.
References
[1] https://en.wikipedia.org/wiki/Photosynthesis
[2]. https://edition.cnn.com/2021/10/22/europe/grasslands-carbon-storage-climate-cop26-intl/index.html
[3] https://en.wikipedia.org/wiki/Carbohydrate
[4]https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3909232/#:~:text=Bone%20is%20a%20heterogeneous%20composite,by%20weight)2%20and%20water.
[5] https://www.britannica.com/science/bone-anatomy/Chemical-composition-and-physical-properties
[6] https://www.hindawi.com/journals/tswj/2016/3182746/
[7] https://en.wikipedia.org/wiki/Protein
[8] https://www.britannica.com/science/protein/General-structure-and-properties-of-proteins