Certainly, here are case studies of organizations that have implemented green IT practices in the areas you mentioned.1
References
1Abdullah N, Lim A. The Incorporating Sustainable and Green IT Practices in Modern IT Service Operations for an Environmentally Conscious Future. Journal of Sustainable Technologies and Infrastructure Planning. 7(3):17-47. https://publications.dlpress.org/index.php/JSTIP/article/view/33