 According to Hardin, the "ratchet effect" refers to the fact that
(A)overpopulation does not affect the number of people who are poor. (B)overpopulation leads to creation of food banks that help curb poverty rates. (C)world hunger and poverty leads to recognition of rights not to be hungry. (D)the use of a world food bank to feed the hungry leads to an escalating series of emergency situations.
D