So if we destroy irreversibly as much water as we consume petrol (1.5 * 10^10, very pessimist hypothesis IMHO) we have for 10^12 years before consuming more tha

So if we destroy irreversibly as much water as we consume petrol (1.5 * 10^10, very pessimist hypothesis IMHO) we have for 10^12 years before consuming more than 1% of water. This should be fine.