Much of the used computer equipment sent from the United States to developing countries for use in homes, schools and businesses is often neither usable nor repairable, creating enormous environmental problems in some of the world's poorest places, according to a report to be issued today by an environmental organization.

The report, titled "The Digital Dump: Exporting Reuse and Abuse to Africa," says that the unusable equipment is being donated or sold to developing nations by recycling businesses in the United States as a way to dodge the expense of having to recycle it properly. While the report, written by the Basel Action Network, based in Seattle, focuses on Nigeria, in western Africa, it says the situation is similar throughout much of the developing world.

"Too often, justifications of 'building bridges over the digital divide' are used as excuses to obscure and ignore the fact that these bridges double as toxic waste pipelines," says the report. As a result, Nigeria and other developing nations are carrying a disproportionate burden of the world's toxic waste from technology products, according to Jim Puckett, coordinator of the group.

According to the National Safety Council, more than 63 million computers in the United States will become obsolete in 2005. An average computer monitor can contain as much as eight pounds of lead, along with plastics laden with flame retardants and cadmium, all of which can be harmful to the environment and to humans.