if you washed your hair one time fewer a week: what it is worth, in numbers

2 000 → 2 billion litres of water about 2,000 litres of water and about 25 kilograms of co2e a year.

method per-person, per-year estimate from the cited study (EPA WaterSense; DEFRA factors), world-average where the study allows; the million-people column is straight multiplication. 'for scale' divides by 0.8 t CO2e, the meat-free yardstick.

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