That's my point - the 0 in Fahrenheit is not relevant, it's completely arbitrary. 0 C is useful, so useful in fact that in the US weather reports they often report "degrees of frost" which is, duh, how many degrees below freezing it is. I think the Celcius scale is adequately fine for temperature. If you can tell the difference between a 68 degree day and a 69 degree day, hats off to you.