Figure 1.
The image consists of six maps, labelled a to f, showing the eco efficiency index for the U K across the academic years from 2015 to 2021. Each map presents variations in eco efficiency indicated by a gradient scale representing different efficiency levels. The top left corner of each map includes a zoomed in inset of the Shetland Islands. The final map, e, includes a legend detailing the ranges of eco efficiency values, including intervals such as 0.01 and 0.437, with a separate indicator showing areas where data is unavailable. The layout flows from a on the left to f on the right, providing a chronological overview of eco efficiency trends over the stated years.Spatial distribution of eco-efficiency scores for UK universities, 2015/2016–2020/2021. Panels (a)–(f) correspond to the academic years 2015/2016, 2016/2017, 2017/2018, 2018/2019, 2019/2020 and 2020/2021, correspondingly. Eco-efficiency values are represented by data envelopment analysis scores, which range from 0 (indicating the lowest efficiency) to 1 (signifying frontier efficiency). Color categories represent the natural breakpoints (Jenks) classification applied to the distribution of eco-efficiency scores in each year