Yeah, I am saying they are not “changing” the data. Your claim of common knowledge is purely bogus. Maybe it’s a common belief of the alt right deniers, but it’s not common knowledge.
What NOAA and any scientist must do when attempting to make data comparable over long periods of time is adjust for time of day the temperature measurement was taken, changing locations, or accuracy of temperature collection method (mercury vs digital)…as described here: https://www.theguardian.com/environment/climate-consensus-97-per-cent/2016/feb/08/no-climate-conspiracy-noaa-temperature-adjustments-bring-data-closer-to-pristine
The point is simply this: you can’t compare raw data when the locations are not the same or the time of day is different. If the old temperature data was mostly gathered in the morning and the new data was gathered mid-afternoon….and then some scientists said the raw data showed a large increase in temperature over time…you would scream bloody murder about the fake comparison. And you’d be correct to do so. Some adjustment is necessary to make data sets comparable. But yes, you can question the accuracy of any adjustment. That should be and very likely is part of the peer reviewed process. If you want to compare sets of data collected differently, you need to make adjustments, but you’d better be able to defend those adjustments.
As for glaciers, they are retreating worldwide with only a few localized exceptions. The rate of melting is increasing. That said, as warmer temperatures also increase water vapor in the air, heavy snows are more likely which can temporarily increase the size of any one glacier. So yeah, it’s not a straight line of decrease every year on every glacier. We see something similar every year downwind of the Great Lakes. The warmer the lakes heading into fall and winter, the more snow results when cold winds blow over them.
The output of the sun is being measured. It is not increasing, but has actually decreased slightly over the last 35 years. As for CO2, in the past it has followed temperature increases that were likely due to the sun or a changing orbit. However, we now have a situation where man is producing almost all of the additional CO2 and it is forcing the rise in temperature despite the fact that the sun is producing less radiation. CO2 doesn’t block the heating radiation from the sun, but does block the radiation from the earth which would send the heat back into space.