Increasing birth rates are threatening food security in some countries., Changing diets in developed countries means scarce food resources are transported around the world., New pests and pathogens that affect farming and reduce crop yields., Environmental changes that affect food production, such as widespread famine occurring in some countries if rains fail, The cost of agricultural inputs such as fertiliser, seeds and machinery can be too expensive., Conflicts that have arisen in some parts of the world which affect the availability of water or food.,

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