Seventh world religion created in the decline of Christianity in the west (people like to believe in a good/bad scenario) and this sprang up in its place.
Pretty plants = Good
People = Sin
Demonic Being = CO2 (0.03% of Surface air)
Religious events include whatever Bob Geldof is plugging, BBC 6 O'Clock News (also known as climate change service)and of course, Earth Day.
On earth day it is customary for followers of Environmentalism to rearrange the solar panels on your roof in the shape of a peace symbol, and make everyone in your household bathe in the same tub full of water, then scoop out a big pot and boil it for soup - reduce, reuse, regurgitate.
Customs include making up numbers and global warming/cooling (depending on trends) and getting all evangelical about such stuff. The sole aim of environmental groups is to keep the world 'natural', or essentially keep Africa in the dark ages.