The creativity that they displayed in creating this solution to an environmental problem is more difficult to measure than the creativity that is displayed when a person creates a product. As R. Keith Sawyer explains, creative processes that require improvisation in order to solve a problem or achieve a particular end are must more difficult to understand and study than the type of processes that simply end in a product. However, Jen and Grant have clearly come up with innovative ways to reduce their waste and consumption in response to a major environmental problem. This indicates that they were mostly extrinsically motivated, as Mary Ann Collins and Teresa M. Amabile explain, to find a solution to their problem. Though there is certainly the possibility that there was some intrinsic motivation in play, the fact that both Jen and Grant found that they often did not enjoy the project indicates that it was mostly done for the end of environmental protection rather than for a love of the process itself.
If you are interested in more information on their project or how they solved some of the problems they came across, check out the movie. The trailer can be found here.