Aluminum is woven into the fabric of our daily lives as a society. Whether for aerosols, storing food, or secondary packaging systems, aluminum is found everywhere and enhances everyday development. 

Yet, its widespread use does not come without concerns regarding the environmental impact of aluminum’s cradle-to-gate process for virgin material. Extracting aluminum from bauxite ore demands substantial energy throughout the mining, refining, and smelting stages, resulting in elevated greenhouse gas emissions. This creates a dual reality: while aluminum is noted as a highly recyclable material, its initial virgin production remains a carbon-intensive process.

With sustainability driving the modern market, it is imperative that global warming concerns be acknowledged about the environmental impact of aluminum throughout packaging and product development. While it may not be suitable for all applications, it also offers opportunities to align with a company’s sustainability goals. For example, aluminum currently holds one of the highest post-consumer recyclability (PCR) compared to other common materials. Being informed about both the role of aluminum in the market and its environmental impact can help empower companies to design strategic sustainability goals. 

Where Aluminum Begins

The adoption of aluminum in the marketplace stems from its abundance. The primary ore used to extract aluminum, bauxite, is the third most abundant element in the Earth’s crust by weight. It takes four metric tons of bauxite to produce two metric tons of alumina, which in turn provides one metric ton of primary aluminum metal (Statistica). 

Bauxite deposits are commonly found near the Earth’s surface and are typically extracted by open-pit mining. The country with the largest bauxite reserves, according to Statista’s 2022 data pull, is Guinea with an estimated 7,400 million metric tons of bauxite. Following Guinea, Vietnam ranks second with 5,800 million metric tons, and Australia ranks third with 5,100 million metric tons. 

While Australia ranks third in global bauxite reserves, its highly efficient mining sector consistently keeps it at the forefront of global production with an output of approximately 980 million tons. At this current rate of extraction, the International Aluminum Institute projects that commercially viable bauxite deposits within the earth’s core will be available for approximately the next 100 years.

The Ecological Cost of Production

The manufacturing process of aluminum comes with a heavy impact on the environment. This impact is driven by bauxite extraction, global transportation, and the energy-intensive process involved in both refining and smelting.

Mining virgin aluminum primarily impacts the environment through its high global warming potential, water consumption, depletion of fossil fuels, and freshwater ecotoxicity. Because extracting raw material from the earth, such as aluminum, has such a heavy impact, finding ways to maximize aluminum recycling or alternative methods has become a critical environmental priority.

Aluminum production is a significant source of global perfluorocarbon (PFC) emissions, which are highly potent greenhouse gases known for their long-lasting presence in the atmosphere, according to the EPA. To illustrate their stability, consider that CF4 and C2F6, two common PFCs, have estimated atmospheric lifetimes of 50,000 and 10,000 years, respectively. 

During aluminum production, the freshwater ecotoxicity is affected. When nutrient-rich runoff from aluminum production reaches water bodies, excessive algae growth blooms, which disrupt ecosystems. The entire cradle-to-gate process demands massive amounts of energy, a significant portion of which is still supplied by fossil fuels.

The Power of Recycled Content 

Although aluminum has major effects on the environment, its nearly infinite lifespan without loss of quality means that, once produced, it can remain a valuable resource in the circular economy forever. Because it can be infinitely recycled, recycled aluminum creates significantly less contribution to the environment compared to virgin material. 95% less energy is required to smelt and recycle aluminum versus the process for new material.

However, the aluminum recycling process requires a large amount of chlorine to remove magnesium. This process has the potential to increase water pollutants, which contribute to freshwater ecotoxicity. Nevertheless, according to comparisons using EcoImpact-COMPASS, this impact is still much smaller in recycled aluminum than it is from the impacts using virgin material. Recycled aluminum remains a highly sustainable alternative that supports the circular economy. Reviewing the PCR content is paramount when choosing aluminum products that align with sustainability goals. 

In the United States, 80% of all aluminum content is made of recycled material. Aluminum cans are composed of an average of 73% recycled content, while glass bottles have an average of 23% recycled content and PET bottles an average of 3-10%. Increasing PCR content in any material helps divert mass going to a landfill, but for aluminum, it particularly minimizes the environmental burden associated with its virgin production. 

Aluminum also stands for both companies and consumers as one of the most recycled materials. In 2018, the EPA calculated that only 1.3% of all municipal solid waste collected in the United States was aluminum, totaling 2.7 million tons of material. The success of post-consumer aluminum recycling depends heavily on consumer compliance and regional infrastructure. For example, in 2018 the total recycling rate of aluminum in the United States was 34.9%; whereas in Europe, their recycling rate was much higher, totaling 76.1%. Nevertheless, aluminum still stands out in both regions for its recyclability across the board.

Shifting into a Sustainable Future

Aluminum has had a positive impact on making everyday lives more functional and practical. Bauxite remains a common and accessible resource in many parts of the world, making it a rather easy process to produce aluminum. Because of the availability, aluminum is only going to become increasingly more common, so acknowledging the tradeoffs is crucial. PCR content is an important factor throughout the packaging and product design process, and we would encourage you to use recycled aluminum material where possible.