What worries me is that if this warming trend continues the Gulf Stream could be erased when it’s waters get north, but don’t freeze creating saltier/heavier water that will sink and flow back to the equator. Then we really will get cold weather in the north and especially Europe which could start the next ice age. I am 80 years old have lived in the East and the Middle West, and I have watched the warming trend for several decades now. Whether it is anthropogenic or not, warming is really happening. Reducing fossil fuel use may not be the answer, but we do need to consider our low lying cities and military facilities, also drier and wetter areas that need to change operating procedures and crops. Already we are seeing more major hurricanes, much heavier rainfall and flooding, etc.
One thing to consider is that in the last interglacial period, temperatures spiked considerably higher than what we are experiencing now. Those temps were not anything like most of the period 10-100 million years ago, but, definitely warm enough that the oceans would be a lot higher.
One interesting thing I read recently: During the Cretaceous period, or at least parts of it, bubbles in amber fossil indicate that atmospheric O2 levels (not CO2) may have been as high as 35%, compared to about 21% presently. VERY interesting...