Is “Environmental Impact” the Ninth Waste?
For decades, Lean practitioners have relied on the 7+1 Wastes as a cornerstone of continuous improvement. Whether remembered through the TIMWOODS acronym or taught directly as forms of Muda, these wastes have helped organizations identify and eliminate activities that do not add value to the customer.
But as new technologies like AI claims more and more resources, a new question is emerging within the continuous improvement community: Should environmental impact be formally recognized as the Ninth Waste?
The Argument for the Ninth Waste
Lean professionals argue that traditional Lean thinking must evolve to reflect today’s realities. In an era of carbon taxes, ESG reporting, and resource scarcity, environmental inefficiency is no longer a “side issue”, it is a measurable operational failure.
From this perspective, environmental impact fits the classic definition of Muda: activity that consumes resources without adding value. Consider the “Environmental Ninth” through these lenses:
- Energy Leakage: Inefficient machinery or HVAC systems running during idle shifts.
- Resource Instability: Water waste or chemical runoff caused by unstable production cycles.
- Atmospheric Waste: Carbon emissions generated by fragmented logistics or “emergency” shipping.
Advocates argue that naming it the Ninth Waste forces it into the Value Stream Map. It stops being a “compliance topic” and becomes a target for a Black Belt’s DMAIC project.
The Traditionalist Perspective: “It’s Already There”
On the other hand, many veteran Master Black Belts argue that a new category is redundant. They contend that if you effectively eliminate the original 7+1 wastes, environmental impact drops as a natural consequence.
- Reduce Overproduction, and you lower the energy needed for storage.
- Eliminate Transportation waste, and you slash fuel consumption.
- Fix Defects, and you stop raw materials from heading to the landfill.
To a traditionalist, environmental waste isn’t a separate category; it is the symptom of failing to manage the first eight. If you operate truly Lean, sustainability follows.
Why the Debate Matters in 2026: The Visibility Gap
So, why is this discussion gaining such momentum now? The answer is visibility.
In the past, a process could be “operationally successful” while being ecologically disastrous. For example, a Just-in-Time (JIT) model might reduce inventory costs, but if it requires ten half-empty trucks instead of one consolidated shipment, the carbon waste is massive. Without a specific “Green Lens,” a practitioner might optimize for speed while overlooking a surge in resource consumption.
With 2026 technology, like IoT sensors and AI-driven energy dashboards, we finally have the data to treat kilowatt-hours and liters of water with the same precision we use for cycle times.
The Verdict: A New Lens for Excellence
Whether environmental impact becomes an “official” Ninth Waste is less important than the shift in our mindset. At The Lean Six Sigma Company, the big question we ask is; “Are we identifying a new waste, or simply measuring the consequences of existing wastes through a different lens?“
We believe the real value of this debate lies in visibility. Environmental impact forces us to ask new questions about familiar processes and challenges us to identify forms of resource consumption that may not appear on a traditional Value Stream Map. Whether we classify it as a waste category or a consequence metric, making these losses visible is the first step toward eliminating them.
Today’s Gemba walks are changing. We aren’t just looking for scrap piles; we are listening for the hiss of a compressed air leak and looking for the “thermal waste” of a machine left idling. These aren’t just “planet problems”, they are profit problems.
Your Challenge:
On your next Gemba walk, don’t just look for time waste. Pick one process and ask: “How much energy or material did this consume that the customer didn’t ask for?” Whether you call it the Ninth Waste or simply “smart Lean,” the goal is the same: a process that is as sustainable as it is efficient.
