In Kittens Game, when does refining catnip to wood get a huge boost in late-game?

I'm trying to figure out what's causing my refine ratio to go way up (like 9 times its previous rate) in late game. I just saw it happen, but i have no idea why. I didn't buy any upgrades. I did buy the piscine mission, but i was watching to see if the ratio went up after i bought it and it didn't.

One minute i could trade in 5000 catnip for something like 110 wood, and the next minute i got 990 for the same 5000 catnip. I'm late game (pre-chronophysics but i have all the other science and upgrades).

So what is it that boosts it so much around this stage?

Early on, the Catnip Enrichment workshop upgrade helps with refining into wood, but I'm guessing that isn't it. Late game, the only thing I can think of is that Bio Labs give Refine Ratio, did you build several of those recently?