This tree-like structure produced in France replaces leaves with mini-turbines that produce electricity. It is quieter and more aesthetically pleasing than standard wind turbines. It also manages to generate electricity even when subjected to light breezes. I would think that this design is also much less likely to kill birds and bats. Maybe this information is not yet available. According to the designers, this "pays for itself" in only two years. I would be more satisfied knowing how much electricity this generates (per given wind speed) in comparison with the more standard wind turbine designs.