DDT

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DDT is a toxic chemical sprayed on the walls of houses to repel and kill mosquitoes to reduce cases of malaria in countries.

Costs:

Disrupts food chain - DDT travels up the food chain in greater and greater concentrations

Highly absorbed into soil

Not sustainable

Strong public opinion that it is a nasty product

Realistically only protects you at night

Western donors banned DDT so they won't finance it

Requires government training and equipment which is costly

Benefits:

Reduces number of mosquitoes

Helps prevent deaths from malaria

Reduces pressure on healthcare

Introduction of DDT reduced malaria deaths in India from 800,000 to 0

Family stability - less parental deaths

Costs a quarter as much as the next cheapest insecticide

Malaria reduces a country's economy by 20% in 15 years so the use of DDT would reduce this