[Dowly]

@Rockstar RE: Temperature measurements

I think it helps if you look at it at a smaller scale. Global temperatures are collected from hundreds of thousands (if not millions) of individual weather stations that take temperature measurements, usually daily. From these individual data sets, you start to build a bigger picture, first a local area then moving to wider region before somewhere down the line you pool it all together as global temperature. This data should be available from your local weather stations, so you could even download it and plonk it all in to excel and see how temperatures in your area have changed over time. (I just did, it was pretty cool!)

As for new methods and equipment, yes of course there will be difference between new and old. That's where calibration comes into play; you don't just switch off the old equipment, you keep it on and compare that data with the new data and adjust as needed. If you have the old equipment running parallel with the new one for a year and see that there's a difference of 0.1C between the two, you know how to adjust the old temperatures to match the new data from the new equipment. I am assuming the 30 year average is constantly running, so as years go by the data gets newer and newer with old temperatures dropping off from the other end.

Global temperature measurements are also not only tied to ground/sea based measurements, satellites keep track of temperatures as well and can be used to corroborate the data gathered from ground based stations.


As for your claim that there is no proof of how CO2 interacts with the atmosphere. That's just not true. Just like every other known gas on Earth, CO2's properties are well known and have been studied for over a century.
One could even do their own experiment to see how CO2 interacts with the sun (or a powerful light). Take two clear containers, one with air and one with CO2 added to the mix. Point a powerful light towards them or have them sit in the sun and use something to measure the temperature inside the two containers. After a while, you will see that the temperature inside the container with added CO2 will show warmer temperatures.