We're going to need exponentially more metals of all varieties to build all the green tech to save the environment, and they have to come from somewhere. If deep sea mining makes economic sense then let's do it!

Now, if deep sea mining only makes economic sense because misguided policy prevents land based mining for the same materials, then sure let's revise the policy instead.

But we need to de-carbonize. If there's any industry that should get a pass on carbon emissions it's mining for industrial metals.