E-waste refers to discarded electronic devices such as cellphones and computers. It is the fastest growing solid waste stream. Developed cities often export e-waste to developing countries where it is improperly disposed of, releasing harmful chemicals. E-waste contains materials like lead, mercury, and arsenic that can pollute the air and water if burned or placed in landfills. The document recommends donating, recycling, or volunteering at facilities like Free Geek that properly deal with e-waste to help address this issue.