Humans gain 3 necessities that they depend on from the process of photosynthesis. Photosynthesis is a chemical process where plants and that contain chlorophyll get energy from the sun, and use carbon dioxide (CO2) and water (H2O) from the environment to then convert the sunlight to food (glucose), while at the same time creating oxygen (O2) and water (H2O) as byproducts.
One of the main products of photosynthesis is glucose. It is the source of carbohydrates like cellulose and starch. It also produces fats, proteins, and sugars such as maltose and sucrose. The plants requires glucose for their growth and energy. All the living people and animals on the earth depend on fats, proteins, and carbohydrates to obtain their energy, that is what makes this is one of the reasons photosynthesis is essential to life on earth. Another product of photosynthesis is oxygen which we need to breathe. The breathing process keeps us alive and photosynthesis provides us oxygen to breathe in.
The level of carbon-dioxide in the environment largely depends on the process of photosynthesis because photosynthesis converts the carbon dioxide in the air in to oxygen which in turn we can breathe unlike carbon dioxide. The level of carbon dioxide depends on the number of plants and trees we have. A big increase or decrease in the level of carbon-dioxide can be bad for the environment.
Industrial revolutions and technical progress have led to too many factories, production houses, buildings, roads, etc. Which cause massive amounts of carbon dioxide to fill up the air and photosynthesis greatly impacts us in helping taking the carbon dioxide out the air.
Photosynthesis is directly related to the life and survival of all the other living creatures on earth. It not just supplies oxygen, without which, breathing and being alive would be difficult, but it also supplies food and energy to all. Going over the facts above it shows how photosynthesis plays a vital role in regulating the life cycle on Earth.