residue from reuse and recycling operations, because loads of surplus electronics are frequently commingled (good, recyclable, and non-recyclable). Several public policy advocates use the terms "e-waste" and "e-scrap" broadly to encompass all surplus electronics. Cathode ray tubes (CRTs) are among the hardest types to recycle.

Using a different set of categories, the Partnership on Measuring ICT for Development defines e-waste in six categories:

# Temperature exchange equipment (such

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