Sustainable Campus: Reducing Environmental and Financial Burdens by Using Pruned Branches for On-Campus Energy

Sustainability activities on university campuses are an important part of building a sustainable society. As a part of this effort, the present study quantitatively evaluated the reduction in greenhouse gas (GHG) emissions and disposal costs upon use of pruned branches for on-campus energy use in a Japanese university. The pruned branches are currently used off campus as fuel for biomass power generation, whereas the proposed systems include their on-campus use for heating through wood-chip heaters in a greenhouse or through wood stoves in buildings. The GHG balance was evaluated using a life-cycle assessment, and the cumulative costs over a 20 y period were estimated. Using pruned branches for on-campus heating was 70–180% more effective in reducing GHG emissions than the current off-campus power generation system. Using branches for heating eliminated the emissions produced by the transportation of pruned branches off campus and had higher thermal efficiency than power generation, which was conducive to the replacement of larger quantities of fossil fuel. In addition, the payback period of the proposed systems was estimated at 2 and 4 y for wood stove and wood-chip heater systems, respectively. For the 20 y period, the cumulative costs can be reduced by approximately 20%.

Developing a Practical Framework of Sustainability Indicators Relevant to All Higher Education Institutions to Enable Meaningful International Rankings

Higher Education Institutions (HEIs) sustainability assessments are receiving significant attention in the academic literature, with ever more complex grading and ranking systems being developed. This paper aims to provide national policy makers with a simple set of indicators to facilitate measuring progress towards sustainability for the HEI sector, within the context of national sustainability data collection efforts. Candidate indicators were identified and assessed from the two most subscribed to HEI sustainability assessments, namely, the UIGreenMetric and STARS, to develop a sector specific indicator set. This resulted in a final set of 12 indicators, covering on-site energy, greenhouse gas emissions, solid waste, water, travel, education, research, and governance. The proposed indicator set was then compared to publicly available data for Irish HEIs, to identify gaps in data collection, which found that direct campus energy use and associated Scope 1 and 2 emission data alone were collected with sufficient rigour. The described indicator set has the potential to be applied to guiding national sustainability transitions globally and offers a template for accelerating sustainability data collection efforts for the HEI sector.