Paganism used to be a catch-all term for any religion in the world, past or present, that was not one of the “Abrahamic” religions (Judaism, Christianity, Islam or the Baha’i Faith). Today it is used among various people to mean any religion that is “earth-centered” in its worship rather than worshiping a deity that is not associated with nature. This would include Wicca, Druidism and other varieties that are polytheistic, though some forms are monotheistic.
Because the gods of modern Paganism are directly associated with nature, Pagans are likely to be dedicated environmentalists. I myself wrote about a form of Pagan worship I am sympathetic to:
Those who see Paganism as the right path for them can find fellowship here:
http://www.cuups.org/ as well as any Unitarian Universalist church or fellowship with a Pagan group. These Pagans, in turn, might lead you to explore and contact other pagan groups that may not be affiliated with UUs.