This site provides links to quite comprehensive Season of Creation resources for Anglican/Episcopal, Catholic, Lutheran and other Christian denominations (although not Orthodox traditions, sorry). They include liturgical materials for Mass as well as other liturgies, reflections, small group discussion resources and even Interfaith prayers suited to the time.
The Anglican Board of Mission released its "Climate for Change" study guide in late August 2020, urging people of faith and hope to become activists for a sustainable future. It takes people's experiences of COVID-19 as a starting point, then challenges them to understand and respond to opportunities to take action. For reviews and where to download these beautifully presented resources for groups, go to:
The Season of Creation runs from September 1 to October 4 each year. October 4 is the Feast Day of St Francis of Assissi, Patron Saint of Animals and Ecology. To find out more about the Season of Creation generally, see: http://seasonofcreation.org/about/
This page is especially helpful for Catholics considering engagement in advocacy for systemic change: https://seasonofcreation.org/wp-content/uploads/2021/05/2021-SOC-Advocacy.pdf