  Data physicalizations have gained prominence across domains, but their
environmental impact has been largely overlooked. This work addresses this gap
by investigating the interplay between sustainability and physicalization
practices. We conducted interviews with experts from diverse backgrounds,
followed by a survey to gather insights into how they approach physicalization
projects and reflect on sustainability. Our thematic analysis revealed
sustainability considerations throughout the entire physicalization life cycle
-- a framework that encompasses various stages in a physicalization's
existence. Notably, we found no single agreed-upon definition for sustainable
physicalizations, highlighting the complexity of integrating sustainability
into physicalization practices. We outline sustainability challenges and
strategies based on participants' experiences and propose the Sustainable
Physicalization Practices (SuPPra) Matrix, providing a structured approach for
designers to reflect on and enhance the environmental impact of their future
physicalizations.
