The agency says one of its biggest concerns is pollution of rivers and lakes by pesticides and fertilizer. Other major concerns are heavy-metal pollution from the production of cement and textiles, and dioxin pollution from mining.

The World Health Organization estimates that more than 25% of all cases of disease are linked to environmental causes. Maria Neira is director of the WHO's Department of Public Health and Environment. She says almost five million deaths from these diseases can be blamed on exposure to certain chemicals.

MARIA NEIRA: "It is an enormous figure -- 4.9 million deaths that could be avoided if we have better management in reducing exposure to those chemicals. Obviously, this figure is a very, is an underestimation."

The U.N. report urges the chemical industry and governments to work together to develop safety policies. It says preventing harm costs less than fixing it.

And that's the VOA Special English Health Report. I'm Steve Ember.

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