Martin B Hocking, a Professor of Chemistry, conducted a 1994 study on disposable and reusable cups. Professor Hocking tested the energy efficiency of different cups: paper, plastic, glass, and ceramic. It was surprising to see that paper and polystyrene were the most efficient options when it came to energy efficiency. 

When producing disposable cups or reusable cups, energy production is an important consideration. Other factors need to be taken into consideration during the production process. These include water disposal, potential toxins released by factories, how they obtain their materials for production, and the product's end-life. Therefore, we should use recyclable products’ (also known as resirkulerbare produkter’ in the Norwegian language) for business and commercial purposes.

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It is important to evaluate each item individually when deciding which products are most environmentally friendly. Is it best to use recyclable products? Are reusable products, such as grocery bags, better? Are there situations where it's better to use disposable products? 

You need to consider the energy and greenhouse gas emissions that were used to make the product, as well as the possibility of continuing to use it instead of disposing of it. Even though stainless steel mugs are made from recycled materials, their environmental impact over the entire life is still greater than ceramic mugs. 

A glass cup is more eco-friendly than a stainless steel mug in almost all cases. Reusable products are more sustainable than disposable products, especially if they don't consume finite resources such as plastic bags and cups. To make a huge impact on the environment, you can look for second-hand items or buy new products that have as many recycled components as possible.