Noctilucent clouds, silvery blue wisps that float high in our atmosphere, are a rare phenomenon – but rising greenhouse gas emissions mean we are seeing more and more of them
Source:
https://www.newscientist.com/article/mg24732911-200-ghostly-clouds-are-appearing-more-often-due-to-climate-change/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home