CO2 causes global warming, now a mortal sin. Breathing creates CO2.

Therefore, stop breathing!

[T]he wilful destruction of the environment [is] a sin

Quite so, and always has been.
Consider the wholesale slaughter of the buffalo, or the ongoing massacre of elephants and rhinos for only their tusks and horns.

'Course, "willful" and "destruction" are pretty big loopholes.

[H]umanity has failed to fulfil "God's will for creation"

Very debatable.
It's probably literally true, but that doesn't imply that we won't in the future, regardless of whatever blunders we've made so far.

[T]he imminent "perilous and catastrophic collapse" of the Earth's ecosystem.

Complete and utter rubbish.
Even if the Earth were to warm by ten degrees F by 2100, (a very doubtful proposition), that wouldn't cause the ecosystem to "collapse", although humans might not like the ways in which it would change.

Pretty much, Bret. It's a sort of fatwa against fire. No word on what they think of the wheel, though I do know oj's agin those.

Forgive me, Father, for I have sinned. It has been three weeks since my last trip to the recycling center.

How long before they take away the statues of the Jewish-looking guy with the beard and replace them with fetishes of Gaia?

According to the Catholic Church a sin is mortal only if it fulfills three criteria:

1. The act is seriously wrong.
2. You know it is wrong.
3. You knowingly commit the act.

Confession is good for the soul, my son.

For your penance, David, you will take out the trash for the next 3 weeks.

Doomed! We're all doomed!

bart;

Don't you mean replace the UN flags, which replaced the statues of the Jewish looking guy with a beard?

Hail Marty, Kyoto monitor of God, blessed among environmental scientists, pray for us now and at the hour of our recycling.

Hey good idea...

Oh my Earth, I am heartily sorry for having polluted you...

Or how about...

Soul of Gaia, sanctify me; Body of Gaia, save me; Air of Gaia, inebriate me; Water from the rivers of Gaia, wash me; Passion of Gaia, strengthen me; Oh good Earth Mother, hear me; Suffer me not to be separated from you; From the Malignant Bushhitler protect me; On the hour of my death call me and bid me return to you; So that with the ghosts of the tree stumps and the cute animals departed I may praise you forever and ever.

For I remember that I am topsoil and to topsoil I shall return.

Sancti Domini Gaia, ora pro nobis. Amen.

Super, Matt, but shouldn't all your "we's" be changed to "us'"? Giving these guys some credit for religious sincerity, they are just promoting neo-paganism under the guise of Christian scripture and institutions. No room for individual blessings or sins in that world. It's all about the tribe.

Peter B:

Why assume sincerity? Have you ever met an ecofreak who wasn't a self-centered preening crackbrain?

Matt:

No, indeed, but they were all very sincere about it.

Mother Gaia, we love all your creation, all the earth and every grain of sand in it. We love the rocks, leaves, the trees, and every ray of your light.

We love the animals; you have given them the purist thoughts and instincts, and blesssed them with joy untroubled. We will not harass them, nor deprive them of their happiness.

We love the natural resources they blanket the earth and are embedded within it's crust, all give reflection of our priceless wisdom and lavish benevolence. We will not rape, plunder or lay waste to them, nor will be have anything to do with those who defile your good earth.

We give you thanks, O Gaia, and bless your wonderful name.

Should we all go out and sh*t in our backyards? Feed the beast, as it were?