Possible Clues:

• Enormous, like a massive coliseum
• Huge reduction in solid fuel
• Great reduction in fuel
• Huge waste cutting fossil fuel
• Huge diminution in fuel
• Massive tax write-off consumed by one of those in the pit
• Truly immense
• Reduction in fuel is enormous
• Big girl's up, finding love after pass
• Giant dog that is straying across mountain in Greece