Very interesting. Atmospherics might also be useful as an RNG or possibly a trustworthy public randomness beacon.

"There are an average of 45 lightning flashes per second around the world. [...] The radio signature (like a fingerprint) of a lightning strike can be detected around the world [...] [R]eceiving ELF/VLF waves allows us to determine the exact location of most lightning strikes on the whole planet, with just a small number of ELF/VLF receivers [...]"

http://vlf.stanford.edu/research/introduction-vlf

http://vlf.stanford.edu/research/global-lightning-geo-locati...