Rankings
Ranked straight from each city's official benchmarking disclosure — the census answers "which building…" questions with data, not press releases.
Biggest emitters
Highest reported greenhouse-gas emissions, latest disclosure year.
Most efficient large buildings
Top ENERGY STAR scores among buildings over 50,000 sq ft.
Least efficient large buildings
Lowest ENERGY STAR scores over 50,000 sq ft — the penalty watchlist.