It comes from a renewable, sustainable resource.

Her research provides evidence for sustainable resource management systems, around common pool resources that have lasted for centuries in some areas of the world.

It develops concepts, strategies and instruments to improve resource productivity and sustainable resource management from the regional and sectoral levels to the international level.

Improving the knowledge of deep geothermal reservoirs and developing techniques are the main goals for the exploitation of this sustainable resource.

Her later, and more famous, work focused on how humans interact with ecosystems to maintain long-term sustainable resource yields.