The primary form of legislative measure used to propose law. Depending on the chamber of origin, bills begin with a designation of either H.R. or S. Joint resolution is another form of legislative measure used to propose law.
Primary focus of measure is regulation of pollution including from hazardous substances and radioactive releases; climate change and greenhouse gases; environmental assessment and research; solid waste and recycling; ecology. Measures concerning energy exploration, efficiency, and conservation may fall under Energy policy area.