> Energy accounting method showed quantitatively that biofuels are not renewable energy sources
That's essentially the same as the argument that electric cars aren't green because they're charged from a grid powered by non-renewable sources.
It's true, as long as the energy input to either system comes from non-renewable sources, neither is really green. But it's not inevitable.
That paper also says the energy yield ratio for biofuels is around 1.5, so it should be possible to make closed loop, renewable production of biofuels using biofuels as energy input.
That's just a fraction of the total for the industry. The vast majority still comes from refineries. That's the greenwashing part, industry trying to muddle the water, as the direct quotes show. On biofuel, changes in land use associated with agriculture make for quite a bad impact as well.
But, as the article says, it's a byproduct of refining, not the reason for the refining, right?
That means the propane will be released and burnt whether people buy it or not. It's better for the environment to use it for a productive purpose rather than flare it off uselessly at the refinery or NG well.
And if we ever do reduce production of oil and natural gas, then a bigger share of propane would be biofuel.
Wikipedia says yes [1], research says no [2].
In any case it seems both better than regular fuels and worse than regular renewable energy sources.
[1]: “Biofuels (and bioenergy in general) are regarded as a renewable energy source”, https://en.m.wikipedia.org/wiki/Biofuel
[2]: “Energy accounting method showed quantitatively that biofuels are not renewable energy sources.”, http://www.globalbioenergy.org/uploads/media/0710_Ortega_et_...