With an official title of “wavemaker,” it’s not surprising that Femke Groothuis, president of the Netherlands-based Ex’tax Project, spends her time advocating for change. What might be surprising is her specific focus: taxation. A political scientist with expertise in international relations and the environment, Groothuis believes that many of our planet’s problems are due to the fact that natural resources are overused while labor is underused — and that those problems can be solved by shifting taxes from labor to resources to create a circular economy. She recently spoke with Ensia and Terry Waghorn of Forbes on how a fundamental change in taxation could help shape a better world.