The answer to this question is convoluted. Sometimes it is best to use a digital outcome, while on other occasions, printing may be better. Considerations for choosing the right outcome depend on shipping, file sizes, materials used, vendors, etc. Server farms that host our online creations and data, can use up to 100 billion KwH of energy nationally ( Energy, Efficiency, & Technology).
The computers and other electronics utilized in the digital world also become an environmental and human health hazard at the end of their lifecycles. However, it is important to point out that this same problem exists in the print design world. We use large and small-scale printers, laptops, scanners, digital cameras, etc. that also end up in the landfill and exported for dangerous disassembly overseas. It's important when deciding between digital versus print to look at the entire system in which your piece will live and die.
Use our Sustainable Systems Thinking guide to help.
Related terms: Carbon Offset, e-waste, Green-e certification, renewable energy