Here are a number of ideas for Earth Day from Building Faith that can be used in a group or at home.
Why Should Christians Care About Earth Day?
"Earth Day celebrates the beauty of this fragile planet, our island home. We are also charged, each April 22nd, with the ongoing care and advocacy of creation. The intersection of faith and Earth Day makes sense for many Christians."
Backyard Scavenger Hunt - The scavenger hunt list is included as a PDF and has a list of items and things for families to look for and talk about.
Holy Hikes with the Psalms - The Psalms are filled with natural imagery. This article has lists of lines from the Psalms which can be used to frame a hike or time spent in nature.
Celebrate creation with wondering questions - a collection of daily practices and rhythms which can become the beginning of prayer and a chance to grapple with what it means to be a created being.