  The climate crisis and the degradation of the world's ecosystems require
humanity to take immediate action. The international scientific community has a
responsibility to limit the negative environmental impacts of basic research.
The HECAP+ communities (High Energy Physics, Cosmology, Astroparticle Physics,
and Hadron and Nuclear Physics) make use of common and similar experimental
infrastructure, such as accelerators and observatories, and rely similarly on
the processing of big data. Our communities therefore face similar challenges
to improving the sustainability of our research. This document aims to reflect
on the environmental impacts of our work practices and research infrastructure,
to highlight best practice, to make recommendations for positive changes, and
to identify the opportunities and challenges that such changes present for
wider aspects of social responsibility.
