From Common Prayer: a Liturgy for Ordinary Radicals --

"In the spring of 1970, Gaylord Nelson announced that a demonstration about the environment would happen on April 22. Approximately twenty million people showed up to celebrate the first Earth Day. Since then, environmental concerns such as oil spills, global warming, extinction of wildlife, and pollution have been pushed to the forefront of political agendas and popular concern. . . . A sixth-century rabbi wrote, 'God, from the very beginning of creation, was occupied before all else with planting, as it is written, "And first of all, the Eternal God planted a Garden in Eden." Therefore, occupy yourselves first and foremost with planting.'"

According to the Earth Day Network:
"In Pakistan, Earth Day Pakistan is in the process of planting 50,000 trees today.
In the Cayman Islands, 1,500 people are participating in a beach and reef clean-up.
In Columbus, Ohio, volunteers are pulling invasive plants, cleaning up neighborhoods, and preparing gardens at over 1000 sites in the region."

And three adorable kids picked up trash at their local park. :)