There’s lots of science that tries to explain what happened after Yosemite. There’s lots of theories and speculations. Some say the massive reduction in fossil fuel usage caused a reduction in the greenhouse gases that kept heat from leaking out into space. Others say all the dust in the air reflected the heat away from us before it even got in. Those are the two big theories. Some say they both worked together to really kill us. The end point is that it got really cold. Even for someone who grew up in Northern Minnesota. And then a few months later there was that whole big badda boom in the other Yosemite. I remember when that was a national park, not a memorial.