Wiktionary
tree-hugging
a. (context derogatory English) Supporting of environment concerns such as combatting pollution, deforestation, etc.
Usage examples of "tree-hugging".
The light didn’t come on when I opened the door, maybe some tree-hugging measure to save power, but I could still see what I was looking for—another couple of two-liter plastic water bottles like the one we’d emptied.