This document assesses the growing regulatory and societal pressure to limit the impacts of climate change, how this applies to shipping, and the implications of this for Scottish ports and agencies concerned with climate change. It is based on a review of academic, industry, regulator and other literature on shipping and port decarbonisation, and assessment of over 40 individual port strategies and actions, in the UK and abroad. In addition 6 ports were interviewed about their ongoing experiences in addressing climate change. It was written in March 2021 as an input to an initial feasibility study into shore power at Aberdeen Harbour Board, led by Buro Happold, which was funded by Scottish Enterprise. A February 2022 update flags policy developments since this initial report.