Earth's oceans used to be green, and they could turn purple next
https://newatlas.com/science/earths-oceans-used-to-be-green-and-they-could-turn-purple-next/
#ycombinator #ancient_oceans #early_earth #green_oceans #purple_oceans #ocean_color_change #great_oxidation_event #cyanobacteria #phycoerythrobilin #iron_precipitation #archean_eon #earth_history #ocean_chemistry #environmental_changes #ocean_color_prediction #ocean_evolution