Factors affecting human food security, and possible solutions

Factors affecting food security, e.g. human population size, changing diets in wealthier populations, sustainability. Factors affecting food security, e.g. cost of agricultural inputs, environmental change, new pests and pathogens. Roles of biotechnology in food security, e.g. genetic engineering to improve yields; use of microorganisms to make food. Benefits of biotechnology must be weighed against risks, costs and ethical issues. Other ways to improve food security, e.g. sustainable production and use of food, limiting climate change.