| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| Georgia-based carpet company Interface makes carpet tiles that are not merely this element "neutral", they're "negative" | carbon | $200 | J | HELPING THE PLANET | 2021-11-29 | #8521 | |
| Burning coal & oil in the Industrial Age has produced this, atomic No. 6--mix it with oxygen & you get a greenhouse gas | carbon | $400 | J | PLANET EARTH | 2016-10-18 | #7382 |