ANTHONY WATTS: In one graph, why the #ParisAgreement is useless.

Even if we DID stay in it, (and all the other countries too) that .05°C savings is likely to get lost in the noise, since global temperature measurements are rounded. For example, in the USA, NOAA rounds the high and low temperature to the nearest whole degree Fahrenheit (0.55°C, a value over ten times greater than the .05°C savings Paris offers):

From NOAA’s REQUIREMENTS AND STANDARDS FOR NWS CLIMATE OBSERVATIONS:

The observer will round the entered data to whole units Fahrenheit by rounding up all positively signed values between T.5ºF and T.9ºF inclusive, (i.e., + 66.5ºF to 67ºF), and rounding down positively signed values between T.1ºF and T.4ºF, inclusive. For sub-zero temperatures, special attention is given to –T.5ºF values, to round it down. This method is known as ‘round half up asymmetric.’ For all negatively signed values between -T.5ºF and –T.1ºF, inclusive you round down (i.e., -3.5ºF to -3ºF) to nearest integer. For negatively signed values between –T.6ºF and –T.9ºF, inclusive, the data is rounded up (i.e., -10.6ºF to -11ºF) to higher absolute value.

Source: http://www.nws.noaa.gov/directives/sym/pd01013002curr.pdf

For Global temperature, GHCN data for example, NOAA rounds to the nearest tenth of a degree C, (0.1°C) TWICE the value of .05°C savings Paris offers.

Even the best case scenario out of the Paris Climate Accord will get lost in the data rounding.

I put on my reading glasses and still couldn’t see any difference on the chart, but maybe you’ll have better luck.