For the first time, US scientists have achieved a fusion reaction with net energy gain. But the dream of limitless zero-carbon energy is still a long way from reality.

Video timeline: 00:00 – What powers the universe 01:04 – ITER: the biggest experiment in human history 04:28 – What is fusion? 06:38 – Replicating the sun 08:38 – The US breakthrough 13:46 – The investors 20:40 – A new class of magnet 24:30 – Dream or reality?

The FT’s Simon Mundy meets scientists and investors in the UK, France and US, to see how close we really are to commercial fusion power.

Read more at https://on.ft.com/3GJl1JF