CATS: Climate-Aware Task Scheduler for environmentally conscious developers

The Climate-Aware Task Scheduler is a lightweight Python package designed to schedule tasks based on the estimated carbon intensity of the electricity grid at any given moment. This tool uses real-time carbon intensity data from the UK's National Grid ESO via their API to estimate the carbon intensity of the electricity grid, and schedules tasks at times when the estimated carbon intensity is lowest. This helps to reduce the carbon emissions associated with running computationally intensive tasks, making it an ideal solution for environmentally conscious developers. The source code can be found at https://github.com/GreenScheduler/cats.Acknowledgements We are grateful to the staff of the Software Sustainability Institute and the organisers of Collaborations Workshop 2023 (CW23), whose efforts allowed us to enjoy the process of beginning the development of CATS as part of the CW23 Hack Day, and to others who contributed to the development via bug reports, questions, and the other contributions that help open-source software evolve. The author list is in alphabetical order. This work has been supported by the Software Sustainability Institute EPSRC, BBSRC, ESRC, NERC, AHRC, STFC and MRC (EP/S021779/1) and UKRI (AH/Z000114/1) grants.