https://www.flickr.com/photos/123526936@N07/17001003589 https://www.flickr.com/photos/39735679@N00/426262117 https://www.flickr.com/photos/57873306@N00/2700487598 https://www.stickpng.com/img/nature/clouds/small-white-cloud
kilbergr/real-concern
[1965 - A US President's Advisory Committee panel warns that the greenhouse effect is a matter of "real concern"](https://www.bbc.com/news/science-environment-15874560)
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