[silverquiet]

It's one of the bonkers things to me that the air my parents breathed as children is measurably different from the air we breathe today. (Sort of like how boomer infants had measurable radionuclides in their teeth due to surface testing of atomic weapons, which helped convince the world to ban the practice.)

I've also heard that the total mass of the carbon we've injected into the atmosphere exceeds all the mass of our built world on the surface, which is sort of awesome to think about, but not in the good sense of the word.