Growing crops like wheat, barley and corn are amongst the most sustainable means of food production.

The graphs shows the acceleration of the world's population and their corresponding energy use. Note that for the right-hand graph exa is 10¹⁸

Not surprisingly, I would imagine a graph of food demand would be similar to provide the whole population of the world, ideally, with food security.

This begs the question 'how do we maintain a constant food supply in a sustainable way and protect the environment in the process?'.

Although I have no data myself on the world's total food production, there are some graphs on ...

https://ourworldindata.org/yields-and-land-use-in-agriculture ...

which clearly show a similar pattern in rising agricultural production attempting to meet our needs.

BUT how long can this be sustained?, and there are millions (billions?) of undernourished people suffering from starvation and disease, primarily from lack of local food production for one reason or another e.g. climate conditions, war, overuse of soil using non-sustainable agricultural practice.

Key biology points Source of information are based on the syllabus-specifications for students taking the AQA GCSE, Edexcel GCSE and OCR GCSE level biology examinations (~US grades 9-10).

Key ideas, and examples of food production explored further in sections 3, 4 and 4a to 4j

Biology Revision Notes on Population Growth, Food Production, and Food Security

1. Rise in World Population

• The global population has been rising significantly over the past century due to improvements in healthcare, sanitation, and food availability.

• In 1950, the world’s population was around 2.5 billion. By 2025, it is estimated to exceed 8 billion.

• Population growth rates vary by region, with developing countries experiencing the fastest increases due to higher birth rates and improved survival rates.

Reasons for Population Growth

• Medical Advances – Vaccines, antibiotics, and healthcare improvements reduce mortality rates.

• Agricultural Improvements – Better farming techniques and food preservation have prevented mass starvation.

• Sanitation & Hygiene – Reduced spread of diseases and improved living conditions have increased life expectancy.

2. Need to Increase Food Production

• As population size grows, food demand increases. Without adequate food supply, millions can suffer from malnutrition.

• Expansion of urban areas and climate change threaten traditional farming methods, so new techniques must be used to improve food yields.

Ways to Increase Food Production

• Genetically Modified (GM) Crops – Engineered to resist pests and harsh weather conditions.

• Vertical Farming – Growing crops indoors, using stacked layers to save space.

• Hydroponics – Growing plants without soil using nutrient-rich solutions.

• Selective Breeding – Enhancing livestock and crops with desirable traits like higher yields.

• Reducing Food Waste – Proper storage and distribution can prevent unnecessary food loss.

3. Importance of Food Security

• Food security means ensuring that all people have access to sufficient, safe, and nutritious food to maintain a healthy life.

• Lack of food security leads to hunger, malnutrition, and economic instability.

• Climate change, conflicts, and natural disasters can disrupt food production, making long-term food security essential.

Measures to Improve Food Security

• Sustainable Farming – Using eco-friendly techniques to increase production without damaging the environment.

• Improved Infrastructure – Better transport and storage facilities prevent food loss.

• Government Policies – Subsidies and regulations to support food production and distribution.

• Education & Awareness – Teaching communities about efficient food use and agricultural best practices.

Conclusion

As the world’s population grows, increasing food production is essential to ensure global food security.

Advances in agricultural technology, sustainability efforts, and responsible consumption will play a key role in meeting future food demands.

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Summary of learning objectives and key words or phrases

Appreciate that as the world's population increases, there is a need for increased food production and energy to provide food security.

Know how food security defined and its consequences for populations all around the Earth.

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