Wired magazine has run an article about how our sky is changing, possible due to global warming.
This really catches my attention, "fundamentally new phenomenon in the temperate mid-latitude sky." The picture of the Eiffel Tower is of fireworks, except you can also see Noctilucent clouds lit up in the background. These appear after sunset and before sunrise and can be seen at twilight and early night.
Addtional links (check out the photos):
Noctilucent cloud, Wikipedia
Noctilucent Cloud Sighting, YouTube
EarthMatters: Noctilucent Clouds, watch the video.
Noctilucent Clouds, Night Sky Observer
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