There has been no appreciable global temperature trend for the last 100 years, warmer or cooler, other than a very slight cooling trend. There have been warm periods and cooler periods that occur cyclically, driven primarily by solar activity. It was much warmer in the US in the 1930’s, the decade of the Dust Bowl following a seven year drought, than it is now for instance. We had very cold winters in the 1970’s, then mild winters in the 1980’s and nineties, now veering back to something like average. All cyclical, it has nothing whatsoever to do with atmospheric CO2 concentrations. So global climate has been very stable for most of our lives. That may be changing now as we enter the grand solar minimum. In all likelihood there will be sharply colder temperatures for decades to come.
