PG&E has crews going all over Northern California removing or trimming trees that could fall onto power lines and start a wildfire. I have a healthy, beautiful 3-trunk black oak that they want to cut down. A potential alternative to make it not a hazard to the power lines would be to cut the top 15 ft off of all three trunks, about 1/3rd of their height. Is that better for the tree than cutting it down completely or will that eventually kill it anyway?