Trident could be scrapped without massive job losses, according to a nuclear weapons think tank.
About 11,000 jobs are supported by Trident, the Campaign for Nuclear Disarmament has estimated, and another 30,000 jobs could be supported by replacing it.
However, the Nuclear Education Trust (Net) says eliminating Trident does not have to cost jobs.
The nuclear education charity believes diversifying the UK's defences is the key to protecting jobs post-Trident.
Net board trustee Peter Burt said: "Our independent analysis of international defence diversification tells us that a government needs to be proactive in getting the conditions right for a successful transition from skilled defence jobs to those in the civil sector.
"Net calls on the current and future governments to make use of the findings of this research and integrate them into an effective defence diversification policy."
The House of Commons voted to replace Trident in July 2016 and a new fleet of Dreadnought-class submarines are expected to replace the current Vanguard subs by the 2030s.
The SNP is against renewing Trident, which is based at Faslane on the Clyde. The Scottish Greens and UKIP also support disarmament.
All but one Scottish MP - Conservative MP David Mundell - voted against renewing Trident in 2016.
Net describes itself as an "independent organisation with a clearly-defined education remit" and "not a campaigning" group.
It has previously provided grants to the Campaign for Nuclear Disarmament, the Department of Peace Studies and the British American Security Information Council.