Per NOAA's published annual mean temperatures, the modern warming trend for the U.S., since the beginning of 1950, amounts to an increase of 1.35°C by century end.
But this modern trend is just +0.36° higher than the trend that existed from 1895 to 1949. For the records, that existing pre-consumer/industrial CO2 trend was already at a significant +0.99°C, by year 2100.
Based on the official climate empirical evidence, as the adjacent chart depicts, this recent measly trend increase (a third of a single degree) of climate change (i.e. U.S. warming) is claimed by IPCC scientists to be a result of the modern, gigantic global emissions approximating over 1.2 trillion tonnes since the end of 1949
Yet, the prior period to the modern era experienced a climate change trend that was equivalent to a 1-degree change. Essentially, a built-in, long-term trend some 3-times larger than the additional modern trend increase.
And this larger, pre-modern, in-the-pipeline warming trend took place when human CO2 emissions were a fraction of the modern era's - literally, one-tenth the amount of emissions (see chart).
Then there is the whole embarrassing issue of the great climate science mystery, which includes the U.S. climate records. During the last 17 years that span from February 1997 through February 2014, the continental U.S. actually cooled at a per century rate of -1.0°C (per NOAA's monthly anomalies).
Now what does all this empirical evidence mean?
Well, obviously, the pre-1950 climate change was significantly greater than that of the modern era. Again, obviously, the modern U.S. climate change has been way over-hyped by politicians and government scientists when put into a historical perspective, as above.
Then there is the indisputable NOAA fact that the last 17 years have witnessed a general cooling for the U.S., which, obviously, is at substantial odds with the "consensus" climate scientists predictions and the IPCC's "expert" computer models.
When combining all this very obvious evidence, one can fairly surmise that either global warming is not very "global" or that human CO2 emissions are not a very powerful influence on the Earth's climate or institutional, orthodoxy climate science has failed, badly - or maybe it's a lot of all three.