| Clue | Source | Date |
|---|---|---|
| Employing again | ||
| Being green, in a way | Jonesin | 26 May 2020 |
| Extending the life of | The Washington Post | 15 Dec 2019 |
| Extending the life of | LA Times Daily | 15 Dec 2019 |
| Getting extra value from | Thomas Joseph | 24 Feb 2017 |
| Extending the life of |