For example, the California Department of Toxic and Hazardous Substances distinguishes discarded mercury-containing products and waste oil as separate groups of hazardous waste. Municipalities are in charge of local recycling and trash collection. They can choose whether to contract these services out to private companies or not and how to charge for these services. Municipalities also may adopt approaches of converting waste to energy through methods such as generating electricity from landfill gas. Therefore, municipalities play an important role in everyday waste management. There is, of course, a wide variety of implementation across the country. Solid waste management challenges and issues that should be considered while framing solid waste policy include proper waste generation, segregation, collection, transportation, and disposal methods, landfill management, hazardous and other toxic material management, treatment, incineration, recycling and other technology standards, monitoring, evaluation, and continuous improvement methods. In addition to these issues, policy has to address the short term and long-term economic, environmental, and social costs and benefits, funding methods, and roles of various stakeholders.