Thanks for the explanation on this, there's a lot to tackle when it comes to environmental issues and I sort of lost track of what has to be done, for what, in which direction, and what the realistic effects would be... I mean, when you've got issues as varied as CO² emissions, the plastic "island" in the Pacific ocean and deforestation, you feel like you'd need several brains to keep track of everything.

Still, I wonder whether the current state of the world's economy will bring more ecological practices. I mean, for example, I used to fly twice a year to Southern Europe to inspect stuff like this commercial real estate in Barcelona https://tranio.com/commercial/spain/catalonia/barcelona/ for my company, but these days, it's not necessarily, you can get an assistant on site to do a video visit of the items, or sign documents with electronic signatures.

Exactly, ballistic missiles (or, at this point of the strike, their warheads) are slowed down when reentering the atmosphere - just like satellites and space capsules containing astro/cosmo/spationauts - at much slower speeds. The 2-digit Mach speeds are reached only outside of the atmosphere.

There's a thing that has to be taken into account though, regarding the speed of these missiles; ballistic ones are faster, but reach Mach 20 and similar speeds outside of the atmosphere, while hypersonic missiles reach up to Mach 5 in the atmosphere.

Anyways, "hypersonic" would be a much better term to use for that technology than Trump's "super duper missile"...