Natural resource rationing and restriction (voluntary or otherwise). Reducing that "carbon footprint" or if you can't make the scarifice yourself, you pay for carbon offsets to cancel the effects of your bigfoot carbon monster.
Purchasing substandard products and services in order to benefit Gaia. We are increasingly forced to buy new items on replacement that "save energy" vs. goods/appliances that work properly and efficiently, because the old style has been either been run off/shamed out of the market or outlawed. Don't like the new light bulbs, toilets, and washing machines? Well now, if you were a proper worshiper you would willing embrace the inefficiencies and be happy to make sacrifices in comfort and convenience in order to save the planet. The true believers will let you know if your sacrifices aren't sufficient.
And on a more humorous note, think of all the time people spend rinsing and sorting their recyclables, in order to separate paper/plastic/glass from common/profane trash.
These are then offered up to the garbage god every week or whenever the truck rolls through, or the items are dropped off at some central collection point.
The God of Abraham required perfect sacrifices, the best of the animals, without blemish. Gaia, OTOH, demands... trash. Garbage in, garbage out.
Thanks, Ezekiel. I was thinking along those lines, but wanted to be sure.