Even if the most stringent pesticide residue standards in crops are implemented, there are still residual risks, but if zero residue standards are implemented, humans will face a more serious risk of food shortage. 
the formulation of standards requires a comprehensive balance between the harmful costs of pesticide residues and the benefits of crop production brought by pesticides. Behind this is a tradeoff between total social cost and total income, which is a by-product that human beings must bear in pursuit of the maximization of overall social welfare.
Human beings have no choice but to contain certain pesticide residues in crops