Organic matter - matter that has come from a once-living organism, is capable of decay or the product of decay, or is composed of organic compound.
As a way of turning the tables on the pseudo-scientific twaddle peddled by the tree-huggers perhaps we should campaign to remind people what the word "organic" really means whan applied to a substance.
As oil and gas are the result of bio-degrading vegetable matter (composting on a geological scale) they and their related products are actually one of the most pure organic materials on the planet.
Tell Friends of the Earth to stick that in their pipe and smoke it, cos they say organic means it must be good for them!
And CO2 is pure organic too, being made partly from carbon, so what's the problem?
QED