The peer review process is a critical step in the production of UNEP publications. Comprehensive peer review helps ensure that content is scientifically accurate, and plays an essential part in safeguarding the reputation of UNEP as a reliable source of objective and factual scientific research, information and analysis. Authors must address constructive feedback provided by peer reviewers before publications are moved on to the editing, copy-editing, and final review processes. UNEP recommends that peer reviewers complete the Certified Peer Reviewer course from Elsevier Academy, in addition to carefully reviewing this document.