Location: GLO - Global
This is a constrained market. The justification for a market constraint is included in the comment field of the conditional exchange.
In this market, expert judgement was used to develop product specific transport distance estimations.
Undefined unit processes (UPRs) are the unlinked, multi-product activity datasets that form the basis for all of the system models available in the ecoinvent database. This is the way the datasets are obtained and entered into the database by the data providers. These activity datasets are useful for investigating the environmental impacts of a specific activity (gate-to-gate), without regard to its upstream or downstream impacts.