The North American Indian Summer was a harbinger of a hotter world.

You know that nice “Indian Summer” we just had in November? It was kinda nice right?

Back in the old days, the temperature high:low average was about 1:1. Sure, it went up and down with plenty of regional variability. But the balance of the world’s climate was fairly steady. One side of the teeter totter didn’t dominate. Since we’ve dumped hundreds of billions of extra tons of greenhouse gases into the atmosphere, this is no longer the case.

In 2009, scientists found that the average for the lower 48 states was about 2:1. That’s a pretty clear signal that things are changing. This November the ratio was…get ready…51:1 in the lower 48 states! That’s obviously a super spike and not a trend itself. But if you put all these in a time series, there’s a clear direction. Up. As it goes up we are seeing late-season wildfires like those in Tennessee and higher tick and mosquito activity in Pennsylvania, New York and New England because the conditions in forests and fields are altered by more heat.

Not only is the direction up, the rate of increase is accelerating. By mid-century the ratio will be around 15:1. What will spikes be like then?
Nothing in nature–not the sun, not volcanoes, nothing–can account for the globe’s warming and the changing climate. It’s too many people burning too much fossil fuel. That’s not nice.

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