Proliferation of cell towers.
Many years ago when I was somewhat active with FS98 and 2000 there weren't many cell towers dotting the landscape. Now they are everywhere. I had a friend at work back in the 1970s and 80s that spent every spare buck he had buying options on cell tower site leases. This was at the beginning of cell phones when they were the size and weight of a brick and everybody thought he was mad. I haven't heard from him in a while but I;ll bet he's pretty wealthy by now.
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....But I like the word; "Proliferation"!.... 

