| 100% | COAL | 4 | Fossil fuel that contributes to global warming |
| 82% | COAL | 4 | Fuel that contributes to global warming |
| 56% | POLLUTES | 8 | Contributes to global warming |
| 48% | COAL | 4 | Black fossil fuel that's burnt to generate heat |
| 44% | COAL | 4 | Fuel source that contributed to London’s Great Smog of 1952 |
| 41% | COAL | 4 | Fossil fuel that's mined |
| 40% | COAL | 4 | Fossil fuel that's mostly carbon |
| 40% | COAL | 4 | Fossil fuel that comes in lumps |
| 39% | COAL | 4 | Fossil fuel that's extracted from mines |
| 39% | ICEAGES | 7 | Periods in contrast to global warming |
| 38% | CLIMATE | 7 | ___ change (problem that's related to global warming) |
| 37% | ACL | 3 | Band that contributes to knee flexion, for short |
| 37% | BIOTIN | 6 | Vitamin that contributes to hair and nail growth |
| 37% | ESTERS | 6 | Compounds that contribute to beer's fruity flavor |
| 37% | MAPQUEST | 8 | Website that contributed to the decline of road atlases |
| 35% | COAL | 4 | Black fossil fuel used to generate heat |
| 34% | GREMLINS | 8 | 1984 comedy horror film that contributed to the creation of the PG-13 rating |
| 34% | BAGGY | 5 | ___ pants, oversized trousers that contribute to the comical appearance of your "Clown" Halloween costume |
| 33% | SOLAR | 5 | Alternative to fossil fuels |
| 33% | WWI | 3 | Global conflict that lasted from 1914 to 1918: Abbr. |
| 32% | ICE | 3 | With 4-Across, something that might splinter due to global warming |
| 32% | RISING | 6 | With 61-Down, global warming consequence, and a hint to the circled letters |
| 31% | RISINGSEALEVELS | 15 | One effect of global warming, and a hint to the five longest Down answers |
| 31% | SMOG | 4 | Pollution that smokestacks contribute to |
| 31% | CLIMATE | 7 | Type of change that's related to Earth's warming |
| 31% | THROTTLE | 8 | Device that controls the flow of fuel to an engine |
| 29% | SMOG | 4 | Pollution that car emissions contribute to |
| 29% | DETENTE | 7 | Global warming? |
| 29% | COAL | 4 | Fossil fuel |
| 29% | OIL | 3 | Fossil fuel |