Let's say I will consume around 2kW just for my computer. With a rounded average of 200g CO2eq/kWh, that means 400g *just* for this activity. A ripe tomato contains around 93% of water. So 7% of dry mass maximum consisting of carbon, would require an harvest of more than 6kg to offset the emission *of that activity and just for today*.
Otherwise, assuming 40% (ref. FAO: from 35% to 65%) of dry biomass growth come from fixed carbon, and that 80% minimum of biomass consists in water, I'd need a garden that yield 5kg of new biomass today.
All this just for the computer.
The question could become: which energy mix would allow me a comfortable harvest to offset the mentioned emissions? 30g COeq/kWh would mean around 900g of tomatoes in a day, something achievable in northern countries or France.
What lesson in all this? If you live in an apartment, you have even less options to make a negligible impact.
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