British actress Rachel Weisz has abandoned plans to turn conservationist Julia Butterfly Hill's life story into a movie - because she has come up against too many studio executives who didn't want to make a film about a woman who lives in a tree.

The Constant Gardener star has been working on the Hill biopic for years, even visiting the eco-heroine in her treehouse home, but no one was enthusiastic about her plan to turn the woman's story into a movie.

Weisz tells The Hollywood Reporter, "She lived up a redwood tree in Sonoma County for two years and four days, on a platform. She was trying to stop the trees from being knocked down. I spent a lot of time with her and I visited the tree, and I found it really moving.

"It was an impossible movie to get made. It was hard enough to make a female-driven drama, but they (studio executives) were like, 'She's just up a tree!'"