this fact:
> requiring 5x agricultural land and fertiliser
can certainly not be paraphrased as:
> marginally more expensive, ecologically
> requiring 5x agricultural land and fertiliser
can certainly not be paraphrased as:
> marginally more expensive, ecologically
Because its one cost in a whole column of costs, reducing that entry is what makes it 'marginal'. Meaning, one part of a large total.