The environmental movement in East Germany 1949-1990:
Non-existent.
Reason? Communism. The Westerners were shocked to discover the place was a cesspool, literally chemically colored open toxic ponds all over the place. This is why I find the communist leanings of many environmentalists so irrational. Communism is their greatest enemy.
This is the primary reason why I do not like it when conservatives compare environmentalists with communists and call them watermelons. This is simply untrue. Environmentalism is far more like Nazism than communism precisely because communism is based on humanism whereas Nazism is based on nature. This is one of the reasons why they did not get along with each other. More to the point, when reds become green, they are moving over to fascism much like many Germans did after the turn of the 20th century.