I was purely responding to the notion that "cyberattack" as a term implies something exclusively non-physical, since it has been used many, many times to refer to techniques that require physical access to the system that is being attacked.
Why would "cyberattack" imply non-physical access? Cybersecurity has always had physical components to it. Would you consider an attack using a rubber ducky a cyberattack?
It's only top 5 most promising if you're heavily weighting based on theoretical upside. We should always be taking moonshots but for climate change and global warming we need to be taking active steps yesterday, and for that fusion shouldn't even be on the list. Fission + some renewables is all we need anyway for almost everything, and carbon capture/removal can take care of stuff that will likely need to rely on fossil fuels moving forward, like aircraft. It's not a matter of way, just will.