Although population,conditions of technology and economy, and climate changes seem to be correlated with the human beings, they are both factors which cannot be changed by a simple policy or a short-term plan less than a decade. Therefore, in this essay, they are classified into the objective factors challenging the food supplies. As iscommonly known, population booming will directly lead to the severe shortage of land and water which are essential to the food production. Weak conditions in terms of technology and economy accelerate the ‘yield gap’ and aggravate the threat, making the poor area more vulnerable (Godfray, et al, 2010).Also, extreme weather along with the deterioration of global climate will damage the crops. Climate changes including global warming will change the seasonal patterns of pollination for crops which would influence their production (Slaght, 2012).
On the other hand, human factors contain more complicated reasons which are different from nations and industries. Generally, several main reasons can be concluded: mismanagement on ecosystems causes the dramatic decline in some species which eventually leads to the reduction of food supply(Slaght, 2012). Along with the regional