The University of Bologna launched the 37 cycle call for applications for the PhD program:
Future Earth, climate change and societal Challenges -> https://phd.unibo.it/future-earth-climate-change-societal-challenges/en/phd-programme/main-research-themes
The program is trans-disciplinary, sponsoring convergence between science, engineering, cultural and socio-economic disciplines.
The application site is here: https://www.unibo.it/en/teaching/phd/2021-2022/future-earth-climate-change-and-societal-challenge