I am playing 1.50.11
The tech "Weather Control System" states that it turns toxic planets into barren planets. I researched this tech, and when I went to go to build it on a toxic planet, it is not available for building.
The planet is:
Large, Toxic, 4/6 pop, Abundant, with buildings:
Robo Miner Plant
(Also I tried building Radiation Shield but it didn't help either)
All the other colonies, it is available to build "Weather Controller".
The description for "Weather Controller" states:
"Modifies a planet's weather patterns to create a more stable farming environment. Food production is increased by +2 per farmer. Will not work on radiated planets. Enhances biomorphic fungi to clean up toxic worlds. Toxic climates become barren"
The tech "Biomorphic Fungi" states:
"Edible synthetic plants designed to grow on lifeless worlds, enabling farming on barren, radiated, and toxic planets. Output is 1 food per farmer."
If I am reading this correctly, if you get Biomorphic Fungi, and then build a Weather Controller, you will then turn a toxic planet into Barren?
Regardless, I think the tooltip for Weather Controller, and Weather Control System should be clarified because I personally did not understand that this other tech was required, because I am not familiar with the game's tech tree. (I assumed Biomorphic Fungi was simply a lore reason to explain how the toxicity is cleaned up). Also, having the second sentence being alone saying "Toxic climates become barren" leaves the target of the sentence unclear. By itself, it might mean that with this tech alone you will make toxic climates barren.
Maybe it should say: "Combines with "Biomorphic Fungi" technology, cleaning toxic worlds to become barren." Or some other way to combine those two sentences.