Hospitals and other health facilities generate an ever-increasing amount of waste, approximately 15% of which may be infectious, toxic, or radioactive. The World Health Organization has been addressing the issue since the 1980s. After initially focusing on high-income countries, it then focused on low-income countries, with unsafe disposal methods in landfills and inadequate incinerators as major concerns. Gradually, the understanding of the issue has undergone several shifts, including from a focus on the component of medical waste considered "hazardous" to all forms of waste, and from accepting medical waste as a necessary downside of high-quality healthcare to seeing the avoidance of healthcare waste as a component of high quality healthcare.