I have a pair of basketball shoes that have the Air technology. My other pair uses the more modern React cushion. Having said that, I'm never buying Nike again after a brief sneakerhead phase. I go for smaller orthopedic brands instead. They're more comfortable too.
From the Wikipedia article:
Nike likewise used it to obtain a patent and to fill the cushion bags in all of their "Air"-branded shoes from 1992 to 2006.[36] 277 tons was used during the peak in 1997.[33]
That's what, ~5 million tons/yr CO2e? That's on par with the operating emissions of a large business - just for the "air" to fill a single product
I'm thinking about nitrogen, but I'm not sure if it stay in place for a few years.
I think that nitrogen is what they're using now. It's readily available, cheap, and fairly easily contained.
Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.
As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades:
How much each change to the atmosphere has warmed the world:
Recommended actions to cut greenhouse gas emissions in the near future:
Anti-science, inactivism, and unsupported conspiracy theories are not ok here.