Which statement about environmental factors in AM is supported by the material?

Which statement about environmental factors in AM is supported by the material?

• A. AM has the highest energy consumption and environmental impacts
• B. AM uses less energy than all other processes
• C. AM uses zero energy in ideal conditions
• D. Environmental impact is always negligible in AM

Answer: (A)

Environmental impact and energy use in AM can be substantial because the processes that build parts layer by layer—such as laser or electron-beam melting—consume a lot of electrical energy, and the production of powders plus post-processing steps add to the overall energy and resource footprint. While AM can reduce waste and enable material efficiency in some designs, the energy required to drive each build, along with finishing, heat treatment, and support-removal requirements, can lead to higher energy consumption and environmental impact in many cases. The material you’re studying supports the idea that AM can have the highest energy use and environmental burden among manufacturing options, rather than being universally lower in energy or negligible in impact. The other statements—that AM uses less energy than all other processes, that it uses zero energy in ideal conditions, or that environmental impact is always negligible—do not align with how energy and environmental factors are typically evaluated in AM.

Environmental impact and energy use in AM can be substantial because the processes that build parts layer by layer—such as laser or electron-beam melting—consume a lot of electrical energy, and the production of powders plus post-processing steps add to the overall energy and resource footprint. While AM can reduce waste and enable material efficiency in some designs, the energy required to drive each build, along with finishing, heat treatment, and support-removal requirements, can lead to higher energy consumption and environmental impact in many cases. The material you’re studying supports the idea that AM can have the highest energy use and environmental burden among manufacturing options, rather than being universally lower in energy or negligible in impact. The other statements—that AM uses less energy than all other processes, that it uses zero energy in ideal conditions, or that environmental impact is always negligible—do not align with how energy and environmental factors are typically evaluated in AM.