>dangerous standard suggested
You have an issue with quality?
Strange, I was on last night an did not see any such discussion
From 2pm Eastern until almost 3am
I remember the multiple posts including "ugly" but don't recall the discussion to which you refer
The islands you refer to are the Dry Tortugas
As far as structures, Fort Jefferson, big old brick thing that is under the control of the National Park Service. There is a cell tower or somesuch there but as to what effect that tiny thing can have on weather all by itself is anybody's guess
Have to fill the old mines
Most underground mining in our state ended more than 100 years ago. There are literally hundreds of abandoned historic mines in North Carolina. We know where a lot of these abandoned historic mines are, but not all, and that can be a problem. The North Carolina Mining Act of 1971 requires mining operations (below and above ground) to acquire permits so there is now a record of where modern mining operations occur.
Another problem is that when you look at the surface of the ground, it is almost impossible to tell exactly in what direction and how deep mine workings go. Tunnels and shafts can extend hundreds of feet underground. Even if we know where an old mine starts, we do not always know where it goes underground. Old maps may be inaccurate and old mines may be inaccessible or too dangerous to enter. Modern technology, such as ground-penetrating radar, may be able to detect the extent of the mine workings. If these workings collapse underground, the land surface could sink, cracking building foundations, or the land could fall into the caved-in area forming a “sinkhole” or collapse hole.
Abandoned mine collapses are relatively rare, but with urban development spreading quickly across our state, it is important to know the locations of old mines. Building above an abandoned mine can be dangerous if the mine is weak or near the ground surface. On Feb. 18, 2000, a collapse hole developed in the front yard of a house in Cabarrus County.
The hole was above the old Phoenix Gold Mine, which closed in 1906. In the 1980s a suburban golf course community was built over the mine. Fortunately, the house was not built directly over the part of the mine that collapsed. The hole was only about 12 feet deep but the mine, according to historic records, went down much further
https://www.deq.nc.gov/about/divisions/energy-mineral-and-land-resources/north-carolina-geological-survey/geologic-hazards/ground-collapse-old-mines-and-prospects-and-sinkholes
What evidence do you have?
So in other words you have nothing but opinion