| Clue | Source | Date |
|---|---|---|
| It may be levied on carbon emissions | ||
| Fine for emissions, say | ||
| Pollution penalty, essentially | Universal | 10 Feb 2025 |
| Carbon levy, for instance | New York Times | 29 Oct 2023 |
| Levy on polluters, e.g | New York Times | 17 May 2017 |
| Levy on polluters, e.g. |