  As the next generation of large accelerator-based facilities are being
considered at the Snowmass 2021 study high priority has to be given to
environmental sustainability including energy consumption, natural resource use
and the environmental impact of effluents. Typically, increased performance -
higher beam energies and intensities - of proposed new facilities have come
with increased electric power consumption. In the following we discuss the most
important areas of development for the sustainability of accelerator-based
research infrastructures in three categories - technologies, concepts and
general aspects. To achieve the goal of increased performance with reduced
energy consumption a focused R&D effort is required with the same or even
higher priority as the traditional performance-related R&D. Such a
recommendation was included in the recent European Strategy for Particle
Physics Accelerator R&D Roadmap.
