Global Warming is based on exactly one item: the average of maximum and minimum temperatures as measured at about 4' above the Earth's surface.

Some discussions go back to the 1840s, others back to the 1880s, others go back 100 years. Doesn't matter, the number is essentially the same.

Australia's official weather service puts the number at 0.74^oC.

The US Weather Service says it is at 0.70^oC.

One European country pegs it at at 0.75^oC.

7/10 degree change in 150 years is trivial. Less that most similar periods in history.

Let's rename it Global Normalcy and move on to important problems.