title: The cleaner state.
mesh_terms: D056804:Biofuels / Q000032:analysis; D002140:California; D002245:Carbon Dioxide / Q000032:analysis; D058735:Environmental Policy / Q000331:legislation & jurisprudence* / Q000639:trends; D000431:Ethanol / Q000032:analysis; D014481:United States; D014484:United States Environmental Protection Agency / Q000331:legislation & jurisprudence
chemical_list: D056804:Biofuels; D002245:Carbon Dioxide; D000431:Ethanol