Heterosexual transmission is the dominant form of HIV transmission in the developing world. Mother-to-child transmission is also more common than in industrialized countries, and can occur through breast milk. Women and children have the highest risk of infection due to factors like anemia during pregnancy and childbirth. The social impacts of AIDS in the developing world include millions of orphaned children by 2000 and increased mortality rates. Environmental impacts occur through increased poverty, food insecurity, and strain on resources from households affected by AIDS. The economic and political impacts are lower labor output, decreased productivity, lower tax revenues, and increased healthcare costs. Abstinence, condoms, and safe medical practices can help reduce transmission when used correctly.