Geoengineers think they can slow climate change. The catch? No more blue skies.
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Can it be green?
Not easily; probably end up gray/white if we do this.
We just need to find a way to grow a film of algae in the sky around the planet. Food source. Absorbs some of the heat which is the big problem most know about climate change. And it's a fun colour. Win win win
And after that, space whales.
That definitely doesn't sound ominous. "The sky above the port was the color of television, tuned to a dead channel."