> - The average Californian lawn is ~500 sqm [0] > - Grass sequesters ~ 85g of carbon per sqm per year, or 42 tonnes per year [1] 500 * 85g/m2 = 42500 g/m2 -

> - The average Californian lawn is ~500 sqm [0] > - Grass sequesters ~ 85g of carbon per sqm per year, or 42 tonnes per year [1] 500 * 85g/m2 = 42500 g/m2 - that's 42.5 kg, not 42.5 tonnes. I haven't checked your original sources, but based on the numbers you provided you're off by 3 orders of magnitude. Intuitively this makes sense, I mean 42 tonnes is a huge amount of carbon to sequester in a lawn. Where would all that mass go? It would mean that the average lawn produces >> 42 tonnes of grass per year.