Bark Gatherer : shoul require any forest in city vicinity (instead of no req)
Apiary : should require (flower OR fruit) in city vicinity (instead of no req)
Straw gatherer : should require grain in city vicinity (instead of no req)
Sand Pit (all) : should add +1 air pollution and +1 with Ecology tech. Sand extraction at a scale big enough for export is not really ecology-friendly
Curare, belladona, Death cap mushroom and Poison's crafter's Hut : Obsolete at Chemistry (instead of Alchimy)
Perfume maker : should have the ressource in city vicinity. Old perfume maker was near the source of the parfume only.
Geology Lab. should add +2% science from Mars Rocks and Moon Rocks
Fencing Academy : Never obsolete (instead of obsolete with Semi-auto weapons). Why go obsolete so early? Fencing is a popular sport in many countries... And a olympic sport...
Giant Bison's Hunter, Auroch Hunter' Camp, Diprotodon Hunter's Camp, ... (other req mamoth in city vicinity building) : No more obsolete. Having these obsolete only make Mammoth far less attractive and disavantage civ in polar climate.
Breeding Program (Giraffe) Req Elephant in city vicinity (instead of the obsolete Ivory)
Guillotine should require Iron wares OR Steel wares OR Aluminum wares (instead of only Iron wares). Should require Rope too
Obelisk : should require obsidian instead of bricks
Oil refinery : should add at least +10 air pollution
LDS Meeting house : should remove access to alcohol (instead of Books...)
Ordinance - alcohol prohibition : should remove access to alcohol and all alcohol-like ressource.
Speakisy : sith the above, no more alcohol req and req (Ordinance - alcohol prohibition OR LDS Meeting house)
(because, seriously, HOW you can have no alcohol in C2C?)
Ordinance - drugs prohibition : should remove access to drug and all drug like ressource.
Ordinance - smoking prohibition : should remove access to Tobacco ressource.
Parking Meters Should require Car Ressource...
Polo Field ; shoul be built with Mammoth trainer too.
Press Agency : +10% unhappy from war instead of -10. News about war dont make people happy.
Propaganda Satellites Shoudld add a -10 education
Cistern, Resrvoir. Should not provide fresh water, but req fresh water... if you dont have fresh water first, you can't have it in a cistern.
Pollution (blackened Sky). Should replace Sundial, Observatory, Moon Dance, Song of the Sky, Military Airbase, Airport and Commercial Airport. Yes, you cant fly if there are far too much pollution.
Alpha Male, alpha Female. No more obsolete.And I dont understand why they should be obsolete...
Pest (Locust) : should require Farm in city vicinity (not sure if it's possible...) instead of grains. No agriculture, no locust.
Pest (Crows). should require Carcass and grain in city vicinity only
Pest (Gopher). should require vegetable in City Vicinity only
Pest (Seagull) should require Raw fish or seashell in city vicinity only
_______
New nuilding idea
Crocodile Hunter's camp Can be built by any crocodile. Req Hunting. +1

, +1

. Provide Lizard.
Scorpionfish Nets. Req Fish and Kava in city vicinity. Req Poison crafting and Boat fishing Techs. Obsolete at Chemistry. +1

. Provide Poison.
Breeding Program (...] Add a breeding program for Diprotodon, Giant Bison and other "prehistoric" animals (same req than the hunter's camp building)
Ordinnance (anti-flying pest programm) . Req Ecology. +1 unhappy, +10% maintenance. Replace Pests (Crow), Pest (Pigeons) and Pest (Seagull)