Scientists have been wondering if the appearance of blue noctilucent clouds at increasingly southern locations is a possible indication of global warming effects.
Blue clouds are becoming more common in certain areas, and scientists are wondering if it could be a sign of global warming.
Noctilucent clouds or NLCs, which glow blue, have been appearing at more southerly latitudes, with sightings as far down as Northern California.
Computer models suggest that as greenhouses gasses warm the lower levels in the atmosphere, the upper layers cool. That scenario is conducive to these high clouds forming.
Tony
