"What we _do_ know for sure, however, is that atmospheric CO2 has a big influence on the earth's climate" So what's the Climate Sensitivity, and to what sigma?

"What we _do_ know for sure, however, is that atmospheric CO2 has a big influence on the earth's climate" So what's the Climate Sensitivity, and to what sigma? "and that we are seeing actual measurable changes in things like average temperatures" The absolute best, gold standard temperature measurement network, the USCRN, has seen little warming since it first began measurements back around 2005. 15 years or so is too short to confidently argue trends, but it is getting close. While the US is, what, 2% of the surface area of the globe, surely this result requires some consideration. Check the data yourself: https://www.ncdc.noaa.gov/crn/ https://www.ncdc.noaa.gov/crn/