Fusion breakthrough is a milestone for climate, clean energy

A major scientific breakthrough in fusion research is announced at the Department of Energy with, from left, Kim Budil, director of Lawrence Livermore National Laboratory, National Nuclear Security Administration director Jill Hruby, Secretary of Energy Jennifer Granholm, National Nuclear Security Administration Deputy Administrator for Defense Programs Marvin Adams, and Arati Prabhakar, the president’s science adviser, in Washington, Tuesday. (AP Photo/J. Scott Applewhite)

WASHINGTON — Scientists announced Tuesday that they have for the first time produced more energy in a fusion reaction than was used to ignite it — a major breakthrough in the decades-long quest to harness the process that powers the sun.