You should do some research on the USCRN (US Climate Reference Network), which was built by NOAA to consistently collect accurate and untainted data, unlike the existing system the climate change proponents have been using for decades.
Guess what they found! The temperature has been stable for the entire 14 years it's been in operation.
It turns out, painting weather stations dark colors, installing them on asphalt parking lots, and installing them near air conditioner radiators and industrial facilities tends to raise the temperatures.
And, I'm pretty sure the methods to detect and quantify CO2 has changed and become more accurate in 150 years. A good rule to follow when performing calculations on time series data - make sure it's collected in the same way throughout the entire time period, otherwise your results may be skewed due to inconsistent data, or as a result of combining two datasets with different baselines.