It's kind of stupid, yeah. My mum has a vegetable patch fertilised by compost, covered in mown grass, and surrounded by some wire that used to be part of a dere

It's kind of stupid, yeah. My mum has a vegetable patch fertilised by compost, covered in mown grass, and surrounded by some wire that used to be part of a derelict turkey shed plus some old rusty steel fence posts she got from a garage sale. Do you count the wire and the fence posts as if they were new? Do you assume the compost is average, even if it's turned properly in her specific garden? Do you count the decomposition of the grass even though it comes from her own property, and do you count it as methane even though it's spread thinly enough to avoid an anoxic environment? Do you count the shovel and wheelbarrow even though she'd still need to own them for other purposes? You can come up with either a bad number or a good number depending on how you choose to represent specific carbon costs.