If the probability of was the same as the probability for PPM and °C, there would be per year instead of .
That is the same as per day or per hour.
PPM = PARTS PER MILLION OF GREENHOUSE GASES
“PPM” is a unit used for measuring the CO2 concentration in the atmosphere. It stands for “parts per million,” and is used to denote the ratio of carbon dioxide molecules compared to all other molecules in the atmosphere.
Explanation of degrees
Increase in global average temperature measured in degrees celsius (°C).