Great idea I think that you just need to tweak some of the policies
Enviromentalism:
Unlocks at Modern Era.
This branch cannot be active at the same time as Autocracy or Commerce.
Opener: Workers may grow forests (works the same way as improvements, time taken is twice the time it takes to grow farms) and improvements can be built on forests and jungles without clearing the forest/jungle first. You can not start wars.
Finisher: All nuclear waste from inside your borders is cleaned each turn. Whenever a nuclear missile is launched upon you, the launcher's civilization gets 20 for 30 turns unless they have adopted Autocracy (indirectly boosts Autocracy).
Ecological Ethics: Workers can grow jungles and make oases in the desert.
Environmental Preservation: Players with a decleration of friendship with you get +8 happiness. Players that declare war on you get a -1 "You are severely against natural preservation." modifier with other players and 5 unless they have adopted commerce.
Biophilia: Cities are in a constant "We Love the King Day" state when you are not at war. Units heal inside own cultural borders as though they where garrisoned in a city.
Enviromentalism:
Unlocks at Modern Era.
This branch cannot be active at the same time as Autocracy or Commerce.
Opener: Workers may grow forests (works the same way as improvements, time taken is twice the time it takes to grow farms) and improvements can be built on forests and jungles without clearing the forest/jungle first. You can not start wars.
I agree with swmanic that the opener would be better if you banned nucleur weapons instead of preventing the player from starting wars.
Finisher: All nuclear waste from inside your borders is cleaned each turn. Whenever a nuclear missile is launched upon you, the launcher's civilization gets 20 for 30 turns unless they have adopted Autocracy (indirectly boosts Autocracy).
I think the finisher should be the citties are in a constant we love the king day and units heal inside cultrural borders as though they are garrisoned in a city.
Enviromental Activism: Reveal all natural wonders on the map that have been found at some point as though you would have just found them. Culture bombing converts 100% more tiles (the hexes beside the hexes that would be normaly converted are also converted).instead of the culture bombing which doesn't make sense why not give solar plants and windmills
Rural Electrification: Roads and railroads increase unit movement by 50% while moving on them.Ecological Ethics: Workers can grow jungles and make oases in the desert.
Just a question do you mean the can grow jungles in the desert and make oases in the desert or make jungles regularly and make oases in the desert
Environmental Preservation: Players with a decleration of friendship with you get +8 happiness. Players that declare war on you get a -1 "You are severely against natural preservation." modifier with other players and 5 unless they have adopted commerce.
I think since this is preservation maybe a set amount of happiness for each forest or jungle worked by a city.
Biophilia: Cities are in a constant "We Love the King Day" state when you are not at war. Units heal inside own cultural borders as though they where garrisoned in a city.
Increase farms by 1 food
Uranium resources generated by the empire. Build Nukes in half the usual time.
Capital.
for every Barracks, Armory & Military Academy. +200 
for each Nuke launched.
Wonders can be destroyed; Bombers recieve Siege I & II. 10% of your 
unhappiness for all other civilizations.
to all other Civilizations.
