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| Bison hunters bringing hides to market, Taylor County, TX, sometime around maybe 1870, via TexasBeyondHistory. |
The daily surface temperature of the Gulf of Mexico last winter never dropped below 73 degrees. You can probably guess how many previous times that had happened: Zero.
This sort of heat has a specific effect on storms: Warmer weather causes heavier rainfall. Why? When the seas warm, more moisture evaporates into the air, and when the air warms — which has also been happening in Texas — it can carry more moisture.
The severity of Harvey, in other words, is almost certainly related to climate change.
Yes, I know the sober warning that’s issued whenever an extreme weather disaster occurs: No individual storm can be definitively blamed on climate change. It’s true, too. Some version of Harvey probably would have happened without climate change, and we’ll never know the hypothetical truth.
Not sure what the "hypothetical truth" is doing in that sentence, actually. I'd say the hypothetical truth is what we do know, and what we'll never know is whether it's wrong.But that sober warning is no longer regarded as quite true, is the thing. I can't remember where I first saw it, sometime in the last few months, but the science is now there; the new scientific consensus is that, while you can't blame a particular extreme weather event on human-caused global warming, you can blame that for the extremity, within certain probability limits.


