Re: Which rocket?
"There were thousands of comments on the internet about loads of concrete dust but I did not see any official document saying there was anything but sand. Concrete did get a mention: SpaceX were asked not to tidy up chunks of concrete to avoid disturbing nesting birds."
Pulverized concrete is sand, but not the sort of stuff you find at the beach. The fine particulates being pumped into the air as also a huge health hazard. SpaceX is required to pick up off of the debris from the nature reserves, but it must be done by hand, not vehicles and machinery. Pieces that have to be broken down must be surrounded by drop cloths to prevent debris from being left behind. All of this requires permission too. The only exception is for the retrieval of things like explosives, toxic materials and batteries. Those much still be removed by hand.
"The quote I was irritated by referred to the largest rocket ever created exploding in a national reserve. The full stack Starships exploded far from Boca Chica,"
The first full stack rained down in Mexican territorial waters. The second stack fed the fish in the gulf of Mexico and a to be determined point off of the coast of Florida. SpaceX did such a hack job that they had no telemetry. If an amateur astronomer could get footage of the upper half of the second stage falling, an antenna located in the same area would have been able to receive telemetry and they would have known it went boom much sooner.
Every other test of just the upper "Starship" has blown up with the exception of SN15 and that was taken apart never flown again. If a full stack detonates at the launch site, it will be very bad for numerous endangered species.