"Lisa the Treehugger"
"Original Air Date: 11/19/00"
Lisa joins a protest group called, Dirt First. Jesse, the head of Dirt First, needs someone to live on the highest branch on a redwood tree to prevent people from cutting it down. Lisa volunteers, but becomes lonely after a few nights and decides to come down and go home. The next day she returns to the tree to find it had been cut down. Then when she returns home she finds out on TV that the tree had actually been struck down by lightning. Now everyone thinks that Lisa had died when the tree collapsed. She decides to pretend to be dead for a while because the company after the forest that the redwood was in said that instead that they would keep the forest up and they would put up a nature preserve there instead. Instead of that, they decided to start a themepark. Now Lisa has to come back and try to stop them.
This episode guest stars Joshua Jackson as the voice of Jesse.
This is Episode #252 in The Simpsons series and it is Episode #4 in Season 12.