Possible Clues:

• Ecological levy
• Element of environmental economics
• Charge meant to reduce emissions
• Factor in environmental economics
• Duty paid by hood in America burning new energy on his chopper?
• Levy on fossil fuels
• Duty for a plant, maybe
• 007 endlessly following one vehicle with another -- one's forgotten C-charge?
• Duty on industry perhaps to have copy press are demanding
• Levy on fossil fuels especially those used by motor vehicles