The contribution of each economic sector of India to its Employment of Labour in 2010(https://commons.wikimedia.org/wiki/File:2010_Percent_labor_employment_in_India_by_its_economic_sectors.png)

The global economic sectors can be easily classified into five distinct groupings:

1. Services Sector
2. Agriculture
3. Manufacturing
4. Transportation/Infrastructure
5. Technology

Other classifications like construction, real estate,tourism, arts, entertainment etc, can be grouped  either under services sector or Infrastructure depending on the classification model employed by relevant agencies in the various countries.

Agriculture is the oldest profession known to man and not Prostitution as widely claimed in some quarters.  Human civilizations thrived or perished at their level of expertise or ignorance on agricultural practice. Survival meant an instinct for food, water, heat and shelter.  With this came devices for hunting and producing more food, tools, for cutting, fire making, shelter making etc.

A great industrialist once said " Agriculture, Manufacture and Transportation are the core essential duties of man, failure of which his life will never see a balance". How true! The modern economy still depends to a large extent on agriculture because of an ever- increasing gap between the rich nations who are self-sufficient in agricultural production and developing nations who are ravaged by wars, diseases, famine, corruption and extreme poverty.
Agriculture is the largest employer of labour in most developing countries of the world today and it is no news that the United Nations with other relevant global agencies, have recognized this as an important means of combating severe hunger, poverty, diseases and malnutrition in many nations.

A case study of a BRICS country (India)

"Agriculture is an important part of Indian economy. At around 1.53 million square km, India has the second largest amount of arable land of any country after the U.S.A.,with percentage of cultivated land compared to total land area being close to 52℅, second highest after Bangladesh(over 68℅) among major labour-intensive agricultural economies. Although the total land area of the country is only slightly more than one third of China’s or the U.S.A.'s, India’s arable land is marginally smaller than the U.S’s,and marginally bigger than china's. In 2008, a New York Times article claimed, with the right technology and policies, India could contribute to feeding not just itself but the world. However, agricultural output of India lags far behind its potential. The low productivity in India is a result of several factors. According to the World Bank, India's large agricultural subsidies are distorting what farmers grow and they are hampering productivity-enhancing investment. While overregulation of agriculture has increased costs, price risks and uncertainty, governmental intervention in labour, land, and credit markets are hurting the market. Infrastructure such as rural roads, electricity, ports, food storage, retail markets and services are inadequate. Further, the average size of land holdings is very small, with 70% of holdings being less than one hectare in size. Irrigation facilities are inadequate, as revealed by the fact that only 46% of the total cultivable land was irrigated as of 2016, resulting in farmers still being dependent on rainfall, specifically the monsoon season, which is often inconsistent and unevenly distributed across the country. To bring an additional two crore hectares of land under irrigation through various agriculture schemes including Accelerated Irrigation Benefit Programme (AIBP)for which a provision of Rs 80,000 crore has been sanctioned in the union budget. Farmer incomes are low also in part because of lack of food storage and distribution infrastructure. A third of India's agriculture produce is lost from spoilage".(https://en.wikipedia.org/wiki/Economy_of_India)

Personal Opinion

Developing and Developed countries around the world all have their peculiarities which make them unique. However, it is important that the young ones take the advantage that agriculture offers as this is guaranteed not only to bring them to a closer level with nature, it will also ensure efficient and judicious use of currently endangered nature's resources, bearing in mind that some generations left what we have now with us and we have similar responsibility to ensure that the cycle goes round.