External STEEPLE influences on PU include the economic recession, the catastrophic chemical-plant accident and contamination, technological change in online teaching and AI, changing student demand and international enrolment, government grants and regulation, ethical and social expectations about inclusion and freedom of speech, and ecological pressure to reduce energy use, waste, pollution and carbon emissions. PU can improve sustainability in 2022/23 by continuing solar electricity, improving energy efficiency, reducing water use and waste, using online or blended teaching carefully, expanding IT equipment and training, reducing unnecessary travel and underused facilities, choosing sustainable suppliers and rebuilding damaged facilities with sustainable design. It should monitor financial, social and ecological results so that sustainability is not limited to the accidental reduction in resource use.