fusion energy is carbon—free, but it is not going to be ready in time to get us out of the climate crisis. that shouldn't stop this research, say supporters. the enormous promise fusion holds means we have got to keep working on it. justin rowlatt, bbc news, oxfordshire. well, earlier, ispoke to steven cowley, who's director of the princeton plasma physics laboratory. steven was previously the director of the culham centre for fusion energy where this latest successful research took place and gave his reaction to the current team's incredible achievement. actually, when i was there, we were working towards this success, it was taking a bit longer than we had hoped, and thejet team had to solve a number of difficult problems to get there. i am so glad they got there. it proves that when you think through the science rigorously, you can make it