“…77 The GPA generally enables to consider environmental sustainability criteria and specifies that "[…] procuring entities may […] prepare, adopt or apply technical specifications to promote the conservation of natural resources or protect the environment". 78 It also indicates that "technical specification means a tendering requirement that: lays down the characteristics of goods or services to be procured, including quality, performance, safety and dimensions, or the processes and methods for their production or provision […]". 79 In other words, the GPA establishes rules for its parties to refer to technical specifications that consider the associated environmental impacts along the product value chain, from production to end-of-life management, as long as they do not create unnecessary barriers to trade.…”