OK, so it’s a ham paraphrase on a Biblical quotation, but as the world loses its appetite for big military assault (particularly for no discernible just reason), we could see more weapons manufacturers turn their metal-working skills over to the production of Renewable Energy :-
https://www.guardian.co.uk/environment/2010/jul/25/bae-green-energy-project
“BAE to assist green energy project : Britain’s biggest arms manufacturer will contribute its marine engineering expertise to a wave-power project off Orkney : Terry Macalister, guardian.co.uk, Sunday 25 July 2010”
The great energy revival could contribute to world peace, after the fading of a Century of competition and conflict over Fossil Fuel resources.