Stiftungsfonds für Umweltökonomie und Nachhaltigkeit GmbH (Foundation for Environmental Economics and Sustainability), or SUN, was established in September 2014 by the Deutsche Post Foundation in Bonn, Germany. SUN supports institutions, programmes, and projects dealing with the challenges and opportunities of environmental protection and sustainable development.

As a Strategic Partner, SUN enables the Ellen MacArthur Foundation to explore new areas of research and insight that will help accelerate the global transition to a circular economy.

The partnership follows a previous successful collaboration between the two organisations, with SUN sponsoring the influential 2015 report Growth Within: a Circular Economy Vision for a Competitive Europe authored by the Ellen MacArthur Foundation and the McKinsey Center for Business and Environment. This was followed by Achieving Growth Within which was produced by SYSTEMIQ in collaboration with the Foundation, and sponsored by SUN.

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